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The difference will vary on the pump, Many submersible pumps can be used externally depending on how they are plumbed. The main difference if with external pumps such as Pan world and Iwaki they will have none water proof components. Feel free to let us know if you have any further questions!
This skimmer will be on average around 150 gallon, With a heavier bioload at 120 gallon. You will need an additional 2 inches to clear the skimmer collection cup comfortably. This skimmer is a great option for a tank of your size with a heavier bio-load. Alternatives include the Vertex 180i or 200i and the Skimz SM163. Feel free to let us know if you have any further questions!
The foot print of this skimmer is 12.4in x 10in. This could fit if you have 12" x 48". Feel free to let us know if you have any further questions!
We can comfortably rate this skimmer on 250 gallon light bio-load, 190 medium and 150 heavy bio load. This would work well on the heavily stocked 125.
This Reef Octopus Classic Skimmer is constructed of high-quality cast acrylic that disassembles completely for cleaning. Its unique Super Cone "wine glass shape" body naturally stabilizes and concentrates the organic rich foam as it rises producing an enhanced foamation.
Fully equipped with a Reef Octopus Aquatrance 3000s pinwheel pump to produce the perfect mix of water and air for optimum waste removal.
Two(2) year on pump body
One(1) year on pump rotor
One(1) year on skimmer body
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Excellent product By DannyC on 8/9/2016DannyC wouldn't recommend this product to a friendThis skimmer is great a lot bigger than I expected high quality built unit it performs great pulling waste out of the water no complaints
Very nice skimmer By Scott on 2/21/2016Scott would recommend this product to a friendRunning this skimmer on 120 gal reef tank in a 55gal sump. Assembly was quick and easy. Started pulling decent skimmate in about 2 days. Would definitely recommend this unit to others.
STARTED SKIMMING WITHIN 3 HRS By Michael on 2/3/2016Michael would recommend this product to a friendThis skimmer started skimming within 3 hours of setting up my new reef tank with live rock. This skimmer has incredible adjustability also. I love it!
Great Skimmer, super efficient By Ray on 10/20/2015Ray would recommend this product to a friendI bought this skimmer to replace my reef dynamics 180 for my mixed reef 180 gallon aquarium. I set this skimmer up on Thursday evening and had half a cup of skimmate by Saturday afternoon. It was the easiest skimmer I have owned to adjust, it is very quiet and doesn't take up to much space in the sump. The skimmer was easy to assemble, I have no micro bubbles that enter my tank. I keep my water level in the sump just at the bottom level of the discharge 45 degree angle pipe. You will see a hole drilled on the top of the 45 degree angle discharge pipe, I just keep the water level below.