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Reef Octopus Classic 100 HOB Protein Skimmer


Starting at $20/mo with . Learn more

Item #: CV20197

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The Classic 100-HOB is a proverbial favorite among hang-on back skimmer users capable of filtering aquariums up to 105 gallons. The Classic 100-HOB features an easy to install and operate design in which the pump is mounted inside the aquarium. To install, simply place the skimmer on the back of the aquarium, mount the pump in place, adjust the intake strainer and it is ready to skim. The Reef Octopus Classic 1000-HOB is constructed of high-quality acrylic and equipped with the new highly efficient Aquatrance pinwheel pump that produces an ideal mix of water and air for optimal waste removal.

Rated for aquariums up to 105 Gallons
Footprint: 8" x 3.75" | Height: 17"
Powered by: Ultra-efficient Aquatrance 1000s pump

Now with adjustable surface skimmer attachment
- Low Profile body
- Air Silencer
- Solid Construction

Filtration Handling
- 105 gallon – Light Filtration Demand
- 80 gallon – Medium Filtration Demand
- 60 gallon – Heavy Filtration Demand

Technical Specs
- Footprint: 8" x 3.25"
- Total Height: 17"
- Fits aquarium rims up to 1.75"

Aquatrance 1000s Pinwheel Pump
- Wattage: 9w
- Air Draw: 420 lph / 15 SCFH*
- Water Draw: 350 lph / 92 GPH*
*Air and water results will vary depending on aquarium setup

Warranty 2 year manufacturer`s warranty on pump and 1 year on skimmer body

5 Stars


Reviewed on
March 26, 2019

Yes, I would recommend this.

Work great

Excellent skimmer but make bubbles in tank.
The black sponges look bad

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Reviewed on
March 25, 2019

Yes, I would recommend this.

Good skimmer

Pros: It works great

Cons: The cup is a little inconvenient

Works great for my 75 gal tank, cup removal is a pain, it held in place by a plastic screw which is in a inconvenient spot, also a pain to get the sweet spot with the cup every time u have to clean it

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Reviewed on
May 08, 2018

Yes, I would recommend this.


Pros: Works

Cons: Bulky, needs adjustments, emits bubbles

After a few days of break-in and adjusting the setup works nicely.
Needs trimming and experimenting with foam blocks to reduce the bubbles.

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Reviewed on
October 15, 2017

No, I would not recommend this.


Pros: skims great

Cons: leaks water everywhere

Great skimmer until you end up with a puddle of water on the floor. This skimmer ran perfectly for a few months and then would not stop leaking. Do not recommend unless you can literally keep your eyes on the thing 24/7.

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Reviewed on
June 04, 2017

Yes, I would recommend this.

Amazing skimmer

Pros: Powerful skimmer, easy to clean, added water volume

Cons: Sort of an eye sore in your DS. Looks better with a black background and with some algae growth on the pump

Currently running this in a 20 gal and its over kill (not a bad thing). The skimmer cup is super easy to clean and it is always pulling out thick skimmate. It is sort of an eye sore in the aquarium and would be much better hidden away in a sump, but I made peace with this prior to buying it.

Was this review helpful? 0 3


Reviewed on
May 21, 2017

Yes, I would recommend this.

Good Skimmer

Excellent Product

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Reviewed on
April 26, 2017

Yes, I would recommend this.

Great skimmer!

Pros: Well built, quiet, and had surface skimmer

Cons: Haven't found any yet

I put this skimmer on a 40 breeder and it just keeps pulling more and more junk from my system. Skimmate is nice and dark once it breaks in and is adjusted correctly.

Was this review helpful? 3 0


Reviewed on
March 07, 2017

Yes, I would recommend this.

red octopus 100 HB

Pros: Easy to set-up, instant bubbles, EXTREMELY QUIET,

Cons: Like all hang on's...........takes up space in the inside of the tank...

I had purchased a CPR Hang on and it was noisy as all hell. Returned it and bought this model. Best thing I ever did.......SUPER QUIET....and very efficient. Will be buying another one for my other tank......

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darryl hey

Reviewed on
July 21, 2016

Yes, I would recommend this.


Bought this for a 30 reef to try it , very impressive. When you first start up make sure the overflow hole is NOT covered and give it time to break in . Works very Good!

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jeffrey reusch

Reviewed on
July 01, 2016

Yes, I would recommend this.

BH-2000 reef octopus skimmer

Packaging was great as usual from Marine Depot the unit was about 50% assembled.Check if all parts are enclosed. Throw away instructions to assemble and install there awful. Grab a cold Beverage go to your computer and watch video on you tube how to assemble and install this skimmer there are many available. The best is about 9 minutes long which is done by coralvue the maker of the skimmer. Also various others which seem accurate.The skimmer is a bit difficult to prime . I have since found the easiest way is to have air inlet plugged completely with unit off once all water chambers are full plug in unit it usually primes with no problem. I have been using unit for close to a month now on my 90g aquarium .I thought my previous skimmer was working ok but compared to this skimmer it was shot. The waste this skimmer produces is such that i clean out collection cup daily. With my old skimmer i would only collect half the amount weekly. With in a 48 hour period my average ph with which i always struggled to maintain around 8.00 is now stable around 8.20. I am astounded with the amount of water intake and the bubbles that are produced by this unit. I have finally achieved the water clarity that the professional reef aquarium stores in our area have.The unit is well constructed and the pump quite powerful. Hopefully it will perform like it is now for quite some time

Was this review helpful? 9 0

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