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D-D Reef-Pro 1800

As hobbyists, with each new aquarium that we own we learn how to identify and improve small details in the design and incorporate these ideas into our next 'perfect system'. 

With the D-D Reef-Pro Aquarium we have taken decades of continuous improvements and incorporated them into our own version of the 'perfect system', affordable and suitable for both beginners or advanced aquarists. 

The flexible design provides an easy to use robust system that can be tailored to suit even the most demanding aquarist and includes all of the essential features required for keeping a successful aquarium.

System Highlights


  • Crystal clear, braceless aquarium with fully polished edges to give an unimpeded view of your own personal reef.
  • Balanced width to height ratio to enhance viewing, aquascaping and ease of coral placement.
  • Unique 'Invisible weir box' design in black glass which almost disappears into the back of the aquarium.
  • Multi-stage weir design provides a high turnover rate in the tank whilst minimising drain down levels in a power loss situation.
  • Special 'Ultra-Flow' weir comb allows 30-50% more water through, so that larger flow rates can be used.
  • Twin overflow pipes offer safe, silent operation.
  • Perfectly matched for use with the D-D Slimline lighting bracket, D-D OTM Rail system and AquaIllumination lighting.



  • Sleek, extra tall cabinet that offers the perfect viewing height for the aquarium. 
  • Modern, heavy duty cabinet construction with high quality finish to compliment the home environment.
  • Extra height internal space for installation and maintenance of equipment.
  • Cabinet supplied pre-assembled as standard.
  • Removable quick release, folding doors to offer improved access for maintenance.
  • Lacquer coated, fully adjustable, soft close hinges.
  • Adjustable feet to allow correct levelling of the aquarium on uneven floors.
  • Good ventilation incorporated into the chiller and sump areas. 
  • Separate dry section with moveable shelf for storage or housing electrical equipment.



  • Twin filter socks with silencing plate (Option when ordering).
  • Sump supplied ClariSea ready as standard.
  • Large skimmer / equipment section.
  • Refugium section for Caulerpa bed or for growing coral frags.
  • Pump chamber.
  • Large separate top-up reservoir.

Aquarium Features

Constructed from crystal clear, low iron high clarity glass, the aquarium features a braceless design, producing a clean and modern display with easy access for maintainance.

By designing the tank to be wider than it is tall we create a more balanced aspect ratio which greatly enhances the viewing experience, allowing easier and more natural aquascaping and coral placement.

An internal weir box can become an unattractive focal point in any aquarium, dictating aquascaping and interupting flow patterns inside the tank.

With this in mind the 'invisible weir box' of the PRO-Reef models has been carefully designed to minimise intrusion into the aquarium whilst exceeding the functionality found in most aquariums.

The Twin pipe overflow system allows almost silent running whilst the use of the D-D UltraFlow weir comb allows the maximum amount of waterflow without raising the water height in the aquarium.

More details on UltraFlow are provided further down this page.

Overflow Box Design

The central overflow on the ReefPro 1800 is made from black glass and has twin tapered sides which makes it blend into the black back panel of the aquarium, a variation of our "Invisible Weir" design.

The single 25mm return pipe spllits into two nozzles which direct water to both sides of the aquarium. Special 'Ultra-Flow' weir comb allows 30-50% more water through, so that larger flow rates can be used.

Cabinet Features

The PRO-Reef cabinet is designed to be extra tall to perfectly balance the aspect ratio of the aquarium and is built for D-D in the U.K to ensure a consistent high quality. 

The top, bottom and front structural uprights of the cabinet are made of 36mm board, making it extremely strong and rigid with excellent load bearing properties, giving the impression of a piece of furniture rather than just a simple tank cabinet. Note that as with any piece of furniture, spilled or standing water must be cleaned up immediately from the surface to prevent damage to the board.

The extra internal height inside the cabinet provides good headroom for use of taller equipment and benefits ease of maintainance. Access is further improved by incorporating removable quick release. double folding doors.

When installing any aquarium it is of the upmost importance to provide a level base, unlevelled cabinets can add stress the glass and can result in an uneven water level in the aquarium. The D-D aquarium cabinet design includes heavy duty adjustable feet allowing for full levelling of the cabinet and aquarium.


Internal Layout

Cabinet with doors removed, showing internal layout and optional ClariSea installed


From mid June 2023, the pipework will be changing on the ReefPro 1800.

The 1800 model uses larger 40mm pipework on the two down pipes and a 25mm return pipe.

As standard the pipework will now be fitted with a gate valve for finer tuning of the overflow water which makes it easier to set the water height and achieve silent running.

The tank connectors will be changing to a fixed pipe length design which means that  they can be tightened up by holding the lower pipe and rotating the top pipe.

As part of the ClariSea ready feature of the ReefPro Aquarium range, we now supply a 40mm flexi pipe to connect directly to the ClariSea.

Sump Features

There are as many ideas about sump design as there are hobbyists.

D-D have many decades of experience in designing, building and running large successful aquariums and have combined this knowledge to produce what we believe is the perfect simple sump layout for the space available.

The ultra quiet twin pipe weir system is further refined by the first section of the sump, resulting in a silent water return with no splashing or gurgling. If using the filter sock arrangement (option when ordering), the water then overflows into a twin filter sock section which incorporates a diffused silencer plate to silence any water noise. The Reef Pro aquariums come as standard with a ClariSea ready sump, with this the filter sock section, if used, can be lifted out and replaced with a ClariSea unit with ease even when the aquarium is filled with water. The main overflow pipework provided will connect in to the ClariSea inlet fitting with the use of a 40mm slip fit PVC aquarium socket, so no cutting or changing of pipework is required.

After passing through the prefilter water flows Into two large equipment compartments. These chambers can both hold equipment such as skimmers, media reactors, calcium reactors etc or you can use one chamber as a refugium with caulerpa/cheato.

Here again there is flexibility to alternate these sections for those who prefer to skim before or skim after the refugium. The final section is a generous sized return pump compartment.

ClariSea Ready

As standard the D-D Reef-Pro range is supplied with a ClariSea ready sump and pipework, this allows the ClariSea units to be fitted easily with no adjustments or modifications.

The ClariSea fleece filter is an ultra compact, patented, high efficiency water filtration system, which continuously removes suspended particles such as micro algae, detritus, food, organic waste and gravel dust from the water column to improve water quality and clarity. The ClariSea design has been continuously developed and improved over 4 years, and is suitable for use in both marine and freshwater aquariums, fish-breeding and coral propagation systems.

At the time of order it is possible to specify the optional filter sock option, this can easily be lifted out at a later date and the ClariSea fitted without the need of tools.

Click here for more information on the ClariSea units

Flow Nozzles

The D-D Reef-Pro aquariums come complete with a 3D printed flow generator and wide outlet nozzle attachment allowing the flow coming from the sump to be directed and taylored to suit your reef.

Ultra Flow Weir Comb

All D-D Reef-Pro aquariums come fitted with the Ultra Flow Weir Comb to allow maximum water flow through the weir without excessively raising the water level in the aquarium. The Ultraflow Overflow Weir Comb maintains a high flow at all times, allowing the use of larger return pumps with a higher flow rate.

The D-D Ultraflow Overflow Weir Comb is designed with a unique arrangement of vertical and horizontal drain slots that allows around 30% to 50% more water to flow through the slotted sections compared to a standard vertical type weir, which in normal circumstances, can result in a much higher running level causing excess drain down in the event of a power cut or in the worst case scenario the aquarium overflowing.

For maintanence the weir comb can easily be removed and cleaned.


UltraFlow Weir Comb


    Reef-Pro Models  
    600 900 1200 1500 1800  
  Tank Specification            
  Length 60 cm 90 cm 120 cm 150 cm 180 cm  
  Width 60 cm 60 cm 60 cm 60 cm 60 cm  
  Height 46 cm 46 cm 46 cm 56 cm 56 cm  
  Glass Thickness 10 mm 12 mm 12 mm 15 mm 19 mm  
  Low Iron Ultra Clear Glass  
  Display Tank Water Volume 138 Litres 210 Litres 275 Litres 425 Litres 490 Litres  
  Invisible Weir Design  
  Removeable Ultra Flow Weir Comb  
  Weir Position Back Right * Back Right * Back Right * Back Right * Back Centre  
  Pre-fitted Basemat  
  Black Vinyl Background  
  * Back Left Option Available  
  Sump Specification            
  External Length 450 mm 675 mm 675 mm 930 mm 800 mm  
  External Width 460 mm 460 mm 460 mm 460 mm 460 mm  
  External Height 386 mm 386 mm 386 mm 386 mm 386 mm  
  Skimmer / Reactor Chamber Dimensions* 233 x 352 mm 251 x 253 mm 251 x 253 mm 251 x 253 mm 251 x 253 mm  
  Reactor / Refugium Chamber Dimensions* N/A 243 x 293 mm 243 x 293 mm 243 x 498 mm 448 x 324 mm  
  Return Pump Chamber Dimensions* 155 x 185mm 175 x 293 mm 175 x 293 mm 175 x 498 mm 448 x 175 mm  
  Top Up Reservoir Dimensions* 80 x 448 x 360mm 105 x 448 x 360 mm 105 x 448 x 360 mm 155 x 448 x 360 mm 288 x 448 x 370 mm  
    *Internal dimensions            
  Glass Thickness 6 mm 6mm  6mm  6mm  6mm   
  Clarisea Ready  
  Removeable Filter Sock Section  
  Sump Running Water Volume 32 Litres 48 Litres 48 Litres 66 Litres 71 Litres  
  Skimmer / Reactor Chamber water Depth 20 cm 21 cm 21 cm 21 cm 21 cm  
  Reactor / Refugium Chamber water Depth N/A 20 cm 20 cm 20 cm 20 cm  
  Top Up Reservoir Volume 13 Litres 17 Litres 17 Litres 25 Litres 48 Litres  
  Top Up Reservoir  Built into Sump Built into Sump Built into Sump Built into Sump Stand Alone  
  Pipework Specifications            
  Main Overflow Pipe 32 mm 32 mm 32 mm 32 mm 40 mm  
  Emergency Overflow Pipe 32 mm 32 mm 32 mm 32 mm 40 mm  
  Return Stand Pipe 20 mm 20 mm 20 mm 20 mm 25 mm  
  Random Flow Generator  
  System Specification            
  Total Water Volume 170 Litres 258 Litres 323 Litres 491 Litres 561 Litres  
  Polished Glass Edges  
  Black Silicone Joints  
  Recommended Return Pump Flow 1000 - 1500 LPH 1500 - 2000 LPH 2500 - 3500 LPH 3000 - 4000 LPH 4000 - 5000 LPH  
  Cabinet Specification            
  Length 60 cm 90 cm 120 cm 150 cm 180 cm  
  Width 60 cm 60 cm 60 cm 60 cm 60 cm  
  Height 102 cm 102 cm 102 cm 92 cm 92 cm  
  Adjustable feet  
  Equipment Cupboard  

Available Cabinet Finishes

There are 7 colour finishes available for the cabinet to compliment and match your home decor.

Standard Cabinet Finishes

Carbon Oak (Matt)

Platinum Oak (Matt)

Driftwood Concrete (Matt)

Satin Black

Premium Cabinet Finishes

Ultra Gloss Anthracite

Ultra Gloss Black

Ultra Gloss White

Recommended Equipment

    Reef-Pro Models  
    600 900 1200 1500 1800  
  Recommended Equipment            
  Fleece Filter ClariSea SK3000 ClariSea SK3000 ClariSea SK3000 ClariSea SK5000 ClariSea SK5000  
  Return Pump Jecod DC1200 Jecod DCP2500 Jecod DCP4000 Jecod DCP4000 Jecod DCP600  
  Heater 250W D-D Titanium 350W D-D Titanium 350W D-D Titanium 650W D-D Titanium 650W D-D Titanium  
  Protein Skimmer Deltec 400i Deltec 400i Deltec 600i Deltec 1000i Deltec 1000i  
  Media Reactor FMR75 KIT FMR75 KIT FMR75 KIT FMR75 KIT FMR75 KIT  
  Auto Top Up Unit D-D Compact ATO D-D Compact ATO D-D Compact ATO D-D Compact ATO D-D Compact ATO  
  Water Circulation 2 x Jecod SOW4 2 x Jecod SOW4 /8 2 x Jecod SOW8 /15 2 x Jecod SOW15 2 / 3 x Jecod SOW15  
  Jumpguard Aquarium Mesh Cover TC7575PRO TC12075PRO TC12075PRO TC18090PRO TC18090PRO  
  UV Steriliser Deltec 10W Deltec 10W Deltec 20W Deltec 20W / 39W Deltec 39W  
  Dosing Pump H2Ocean P4 PRO H2Ocean P4 PRO H2Ocean P4 PRO H2Ocean P4 PRO H2Ocean P4 PRO  
  Recommended Lighting   Fish Only Soft Coral Reef Mixed Reef SPS Dominant Reef  
  Reef-Pro 600 Lights Prime 16HD Reef Prime 16HD Reef Hydra 32HD Hydra 64HD  
  Mounting Option Prime Flex Mount 18" Prime Flex Mount 18" HTMG2 Bracket HTMG2 Bracket  
  Reef-Pro 900 Lights 2 x Prime 16HD Reef 2 x Prime 16HD Reef 2 x Hydra 32HD 2 x Hydra 32HD  
  Mounting Option 2 x Prime Flex Mount 18" 2 x Prime Flex Mount 18" 2 x HTMG2 Bracket 2 x HTMG2 Bracket  
  Reef-Pro 1200 Lights 2 x Prime 16HD Reef 3 x Prime 16HD Reef 2 x Hydra 32HD 2 x Hydra 64HD  
  Mounting Option 2 x Prime Flex Mount 18" 3 x Prime Flex Mount 18" 2 x HTMG2 Bracket 2 x HTMG2 Bracket  
  Reef-Pro 1500 Lights 3 x Prime 16HD Reef 3 x Prime 16HD Reef 3 x Hydra 32HD 3 x Hydra 64HD  
  Mounting Option 3 x Prime Flex Mount 18" 3 x Prime Flex Mount 18" 3 x HTMG2 Bracket 3 x HTMG2 Bracket  
  Reef-Pro 1800 Lights 4 x Prime 16HD Reef 4 x Prime 16HD Reef 4 x Hydra 32HD 4 x Hydra 64HD  
  Mounting Option 4 x Prime Flex Mount 18" 4 x Prime Flex Mount 18" 4 x HTMG2 Bracket 4 x HTMG2 Bracket  

Reef Pro Aquariums Installation Guide