Coral Box D300+ Protein Skimmer

(2 customer reviews)


The Coral Box D300+ is an affordable, controllable, and efficient protein skimmer and is ideal for 40-250 gallon aquariums.

13 in stock

SKU: d300



The Coral Box D300+ Protein Skimmer has an internal DC powered pump which greatly reduces its footprint. The Base has a diameter of 5 3/4″, 6 1/2″ including the gate valve. The skimmer is 19″ tall with a neck diameter of 2.5″. The Cup diameter is 5.5″ with a height of 4 3/4″. The skimmer cup has a drain that includes a drain hose and valve.


Every Coral Box protein skimmer includes a fully controllable Coral Box DCA skimmer pump. The pump includes a controller with 10 output modes, which allows you to adjust the flow rate from 10% to 100%. There are 3 feed timers, 10 minutes, 30 minutes, or 50 minutes with 1, 2, or 3 presses of the feed button respectively. Press the button a fourth time to end the feed timer and power the skimmer back up.

The Coral Box DCA pump also has a built in slow start feature, meaning it starts at 0% and slowly builds up in power until it reaches your flow setting. Every pump includes a float switch, which can be mounted directly into your skimmer’s collection cup. When the cup is full, it will shut your pump off and sound an alarm. The days of bubble filled sumps are over!

Every DCA pump is also Apex ready- they are built to accept a 0-10v control input (apex adapter cable sold separately).


The Coral Box D300+ is powered by a sine-wave DC controller. Sine wave controllers use a specific electrical frequency to reduce noise while the pump is running. All you hear is the gentle intake of air and the resulting turbulence from the needle-wheel impeller.


The D300+ uses less power the lower you run your pump. At full power, the Coral Box D300+ consumes 12watts from the wall. At 50% power? 6 watts. They’re not only efficient in terms of power use. The Coral Box DCA pump allows you to dial in your skimmer on a level unmatched by AC pumps. That means you can dial in your skimmer to match your tanks specific needs.

The D300+ Skimmer works on:

Light Stocked Tanks up to 250g

Medium Stocked Tanks up to 200g

Heavily Stocked Tanks up to 120g

We provide a 12 month USA warranty on all Coral Box Protein Skimmers.

Ships From and Serviced in Wakefield, RI USA

Additional information

Weight 7.2 lbs
Dimensions 21.5 × 10 × 8.5 in

2 reviews for Coral Box D300+ Protein Skimmer

  1. Matt (verified owner)

    What a beast of a skimmer. I recently upgraded to a Red Sea 300 XL and decided on this skimmer for the tank. Vinegar bath for an hour to remove any left from manufacturing and plugged it into the system. SILENCE! Almost immediately produced a nice foam head and after tweaking it for a bit I have it set where I think I’m going to run it. The features on this skimmer and the quality of the materials are great. Plus it is VERY quiet which is what I was looking for with this set up.

  2. Matthew (verified owner)

    Started pulling skim right away. It is SILENT!! Has the right combination of features I was looking for and came out a bit cheaper than the other options to boot. I would highly recommend this skimmer.

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