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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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Overall it's a pretty good buy By Kizzy on 3/10/2017Kizzy would recommend this product to a friendLet me just say that this skimmer looks amazing, it's very clean looking and you can tell that it's going to work. Like most skimmer, the first week is jus about tuning it in. Didn't pull as much gunk as i wanted to in the first run. The water output is silenced though this doesn't matter due to the actual sound. The sound is PRETTY loud, i have it under my cabinet and i can definitely hear it. Although people are exaggerating about how loud it is. It's in my room, and it doesn't bother me too much i can sleep peacefully. It's just sounds like a return pump that is out of the water. It's like a jet-like sound. Well, can't expect a beast to sound like a princess. Overall, this thing is definitely a beast.
Replaced my RedSea with this one on my RedSea Max-S500 By Izzy on 3/9/2017Izzy would recommend this product to a friendThe moment I set up this skimmer was when it started skimming. It started to pull out dark skimmate within 36 hours of setting up my reef aquarium. My aquarium has been running for 9 months now with performance far exceeding my expectations. Reef Octopus for life!
Couldn't be happier By John on 2/26/2017John would recommend this product to a friendEasy to set up, simple to adjust, clean. Started to skim within 24 hrs. very quiet. I read a poor review here someone wrote about it being loud. Almost didn't buy it because of this noise complaint. I'm glad I went ahead with it and couldn't be happier.
Very loud! By Stephen on 12/3/2016Stephen wouldn't recommend this product to a friendSkimmer is large, and very easy to set up. It also works great and pulled junk out in a few hours. However, the noise level from it is incredible. It sounds like a turbine on a jet just idling. I upgraded from my Reef Octopus 150S, and this skimmer is much, much louder. Think the noise is coming from the air intake, might mess with that to reduce the noise level.
Sounds like a jet liner By Chris Wincek on 11/26/2016Chris Wincek wouldn't recommend this product to a friendIve had this almost a year. It's extremely loud and can be heard throughout my entire house. Coral vue has quit trying to troubleshoot the issue so I'm left with junk. DO NOT BUY THIS SKIMMER
Skims great but extremely loud. By Christopher on 11/23/2016Christopher wouldn't recommend this product to a friendHad this skimmer for almost a year. Skims good but sounds like a jet liner. The noise it makes can be heard throughout my entire 3 bedroom house. No help from coral vue.
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.