Reef Octopus

Reef Octopus Classic 100 Hang-on-Back Protein Skimmer

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Easy to use, hang-on-the-back skimmer. Hang the skimmer on the back of the aquarium, mount the pump in place per instructions and it is ready to skim. Powered by the 1 Aquatrance 1000 pump with high performance venturi injection system and pinwheel impeller. Built with high-quality acrylic.

  • Manufacturer rated for tanks up to 75 gallons
  • BRS recommended for tanks up to 50 gallons
  • Pump is mounted internally and skimmer rests outside the tank
  • Uses metric plumbing parts
  • Dimensions: 8" x 3.25" x 17"
  • Manufacturer rates skimmer for tanks up to 75 gallons
  • BRS recommended for tanks up to 50 gallons
  • Powered by 1 Aquatrance 1000 pump
  • Maximum air draw: 111 GPH
  • High performance venturi air injection system
  • 1 year warranty on skimmer body and pump

pdf Owners Manual

More Information
UPC 6950291201973
Skimmer Type Hang On Back
Capacity Manufacturer rated for tanks up to 75 gallons
BRS recommended for tanks up to 50 gallons
Dimensions 8"L x 3.25"W x 17"H
Air Draw 111 GPH
Pump Model Aquatrance 1000
Pump Rotor Type Pinwheel
Variable Speed No
Power Type AC
Warranty 1 Year
Pump Included Yes
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Product Questions

If I wanted to mount this on a rimmed tank, what’s the maximum rim thickness that it will support?
Question by: William on Oct 12, 2022, 11:40 PM
Thanks for the question! The max tank thickness is 1.75"
Answer by: James Johnson (BRS Staff) on Oct 13, 2022, 4:03 PM
I want to use this on my sump so the water line is 6 inches below tank edge.
Can I turn the intake pipe to face down so it's under water? Does the pump need to be fully submerged? If so can I add a longer pipe between pump and skimmer body to submerge pump?
Question by: Bill on Nov 28, 2021, 8:42 AM
Hello, thank you for the question. The pump for this skimmer needs to be fully submerged and it is not recommended to modify or extend the pipes. Thanks.
Answer by: Christian (BRS Staff) on Nov 28, 2021, 11:22 AM
What is the footprint of the pump? How much pump space is needed for proper operation?
Question by: Paul Himmelman on Dec 11, 2017, 11:39 PM
Hi there,
Thank you for your question.
The pump on the classic 100 skimmer is 4.5" x 2.4" x 3.6". You would want to give it about 2 inches around the inlet of the pump.
Please let us know if you have any other questions!
Answer by: William Glenn on Dec 19, 2017, 3:34 PM
Can this be used with a 10 gallon sump that is located on the floor? I keep 10 inches of water in it, but I'm wondering if the powerhead would be fully submerged or not? Otherwise what else would you recommend?
Question by: Tom on Jan 7, 2017, 2:35 PM
Great question! You will need a tank that is at least 13" tall to properly "hang" this skimmer on a tank that is resting on the floor. :-)
Answer by: Randy on Jan 11, 2017, 11:59 AM
Will this mount properly on a rimmed aqueon aqaurium?
Question by: Shelby on Dec 12, 2016, 3:14 PM
Great question! This will work well with rimmed as well as rimless tanks! :-)
Answer by: Randy on Dec 13, 2016, 2:25 PM
How much clearance would I need behind my tank?
Also I have a 75 gallon lightly stocked only two medium size fish. Would this skimmer be a good choice?
Question by: Adam on Nov 22, 2016, 3:07 PM
Great question! You will have to account for 3" of clearance behind the tank for this skimmer. It is BRS recommended for 50gal tanks, so you may be better served getting the BH1000 instead. :-)
Answer by: Randy on Nov 22, 2016, 5:18 PM
Hello i just oreded mine and im super excited im just alittle worried about the overflow ive been doing some research and i cant find anything on sertting it up so it wont over flow to my carpet do u guys have any videos on how to start it ?
Question by: Edmond on Mar 26, 2016, 12:12 PM
Great question!
Overflow with hang on back skimmer is an inherent risk and will need to be set up under observation for the first several hours and possibly even weeks during break in. You essentially will move the o-ring on the collection cup to set the cup at its highest level. Once a day for the first week you can slowly lower the cup until the skimate is forming. Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 28, 2016, 11:58 AM