Reef Octopus

Reef Octopus Classic 1000 Hang-on-Back Protein Skimmer

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$309.99 $309.99

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Hang on Back skimmer with pump mounted externally under the skimmer body. Unique design reduces heat exchanged to the water. Easy removal of the pump for cleaning and maintenance. Powered by one Aquatrance 1000 pump with improved venturi design and pinwheel impeller. Built with high quality acrylic.


Well Stocked Tank - Rated up to 55 gallons

Medium Stocked Tank - Rated up to 75 gallons

Light Stocked Tank - Rated up to 100 gallons


Will fit on tanks with a rim under 1.125"


Skimmer Features:

  • Low profile body
  • Air silencer
  • Pump is mounted under skimmer body to reduce heat exchange to tank and reduce space needed for skimmer
  • Easily remove pump for cleaning and maintenance
  • Solid construction
  • 1-Year warranty


Skimmer Specifications

  • Footprint: 8" x 3.5"
  • Height: 17"


Aquatrance 1000s Pinwheel Pump Features:

  • Power Consumption: 9 Watts
  • Air Draw: 420 lph/15 SCFH*
  • Water Draw: 350 lph/92 GPH*

*Aquarium set up will determine air and water results.



pdf Owners Manual

Item #: OCT-BH1000

More Information
UPC 6950291203083
Skimmer Type Hang On Back
Capacity Light Bioload - up to 100 gallons
Medium Bioload - up to 75 gallons
Heavy Bioload - up to 55 gallons
Dimensions 8"L x 3.5"W x 17"H
Max Tank Thickness 1 in.
Air Draw 420 lph
Flow Rate 92 GPH
Pump Model Aquatrance 1000
Pump Rotor Type Pinwheel
Variable Speed No
Power Type AC
Power Consumption 9 Watts
Warranty 1 Year
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Product Questions

How deep should i have the inlet and outlet pipe in my tank?
Question by: Cale on Jan 3, 2023, 5:17 PM
The inlet/outlet is not adjustable. If the skimmer bubbles cannot reach the skimmer cup then you will need to raise the water level of the tank.
Answer by: William Reed (BRS Staff) on Jan 12, 2023, 1:29 PM
Will this work on the back of a JBJ 45 gallon with the overflow compartments?
Question by: David on Dec 31, 2021, 12:57 AM
If you could let us know the dimensions of your compartments we will better be able to assist.
Answer by: Matt Lucero (BRS Staff) on Feb 4, 2022, 1:51 PM
Is the width of the actual box 3.5” inches. Or overall 3.5” from pipe to back of housing. In a pickle. Got 3” from wall to back of tank..
Question by: Dylan on Feb 2, 2020, 10:01 PM
Unfortunately 3.5" would be the minimum you need to make it fit. Even at that it would be a tight fit.

Take care
Answer by: Thomas Billington on Feb 5, 2020, 3:36 PM
Can I use this in 30 gallon tank?
Question by: Vivek Shukla on Jan 31, 2019, 9:01 PM
That is a good question. Yes you can put this on a 30 gallon tank. This skimmer is rated for tanks up to 100 gallons! Just be sure you have a 8" x 3.5" space available outside the tank where you intend to mount the unit. I hope this is helpful. Have a great day :)
Answer by: Ash on Feb 6, 2019, 10:15 AM
Would this work in an aquarium with about 2" wide rim around the top? Thank you.
Question by: Mo on Apr 25, 2017, 10:45 PM
Hey there,
Unfortunately that will be too thick to work with this skimmer. The classic 1000 will work with rimmed aquariums with a rim thickness of up to 1.125".

Happy reefing!
Answer by: Zack on Apr 28, 2017, 11:01 AM
How much clearance do I need between the tank and the wall?
Question by: Matt on Dec 12, 2016, 10:17 AM
Great question! You will need to account for 3.5" - 4" of clearance for proper installation of this skimmer. :-)
Answer by: Randy on Dec 13, 2016, 2:24 PM
I have a shallow tank which is 13 " hight, is this possible to hang on the back?, i dont mind if it hang off exceed the bottom of the tank. But will the skimmer work and funtion properly?
Question by: tommy on Jul 16, 2016, 6:55 PM
Hi Tommy,
The skimmer can hang off the back of your tank, and even if it physically sits lower than your tank that is fine. Ultimately the drain for the skimmer just needs to be able to freely drain back into the tank.
Thanks for the question and if you have any more, let us know.
Answer by: Charlie on Jul 18, 2016, 9:58 AM
I'm currently living is Spain. Can I buy a different pump for the model that will handle 220v?
Question by: Nate on Jun 12, 2016, 6:10 AM
Hi there!
Thank you for your interest in Bulk Reef Supply. At the moment we are currently only able to ship to the US and Canada. For further information on our shipping policies please check out our shipping information located at https://www.bulkreefsupply.com/shipping-delivery
Answer by: Connor on Jun 14, 2016, 6:22 PM
What is the air valve for on hob reef octopus Skimmer 1000
Question by: Joey Gillette on May 8, 2016, 12:07 AM
Great question!
The Air Valve will be for adjusting the amount of air into the skimmer to adjust the amount and shape of the bubbles. this can help to reduce overfilling and keep a solid skimmate production.
Answer by: Connor on May 10, 2016, 5:11 PM
Hi, I was wondering how high this sits above the rim of the aquarium. I have a slight clearance issue, and am wondering how much space I need to get the waste cup off. Thank you very much.
Question by: Len on Mar 30, 2016, 8:46 PM
Great question!
This skimmer will need 5" above the rim of the tank. ideally 6" is nice to have to remove the collection cup and skimmer removal. Feel free to let us know if you have any further questions!
Answer by: Connor on Apr 4, 2016, 10:38 AM
Does my tank have to be a certain height for this skimmer to work properly?
Question by: Santiago on Feb 7, 2016, 10:33 AM
Great question!
Ideally the tank should be around 17" high or higher for this to work well without hanging off the back to the bottom. Feel free to let us know if you have any further questions!
Answer by: Connor on Feb 10, 2016, 6:38 PM
Is it ok to place a media bag in the return side of the skimmer, or is it not enough flow to go threw the bag?
Question by: Brandon on Aug 1, 2014, 12:20 PM
Hi Brandon,
I personally wouldn't put a filter sock on the skimmer itself. The main concern is that if the filter sock clogs up and reduces the output a little bit it could cause your skimmer cup to overflow all over the floor :(
Answer by: Bulk Reef Supply on Aug 1, 2014, 12:20 PM