Reef Octopus

Reef Octopus Classic 110INT 4” Internal Protein Skimmer

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  • Manufacturer Rated for tanks up to 100 gallons
  • BRS recommended for tanks up to 75 gallons


In sump skimmer. Powered by Aquatrance 1000 pump with an improved venturi design and pinwheel impeller. Built with high quality acrylic. Gate valve allows for more precise control of water level. 1/2" clearance required to remove collection cup for easy cleaning.


  • Reef Octopus 4" Classic INT Skimmer CLSC-110INT
  • Dimensions: 10.6" x 6.75" x 19.75"
  • Manufacturer rates skimmer for tanks up to 100 gallons
  • BRS Recommends this skimmer for tanks up to 75 gallons
  • Powered by Aquatrance 1000 pump
  • High performance venturi air injection system
  • Modified cone neck design designed for easy transition of micro bubbles into cup
  • Precision controlled gate valve
  • In sump only
  • 1 year warranty on skimmer and pump
  • Metric plumbing parts.



Reef Octopus Classic 110INT Manufacturer's Manual

More Information
Product Name Reef Octopus Classic 110INT 4” Internal Protein Skimmer
SKU 204061
UPC 950291202846
Maximum System Volume 76 - 100 Gallons
Recommended Tank Size 51 - 100 Gallons
Skimmer Body Types Internal, Standard
Variable Speed No
Wattage 9W
Power Cord Length 6 Feet
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Product Questions

Will this fit in the sump of a reefer 250 V3 sump with refugium
Question by: Kyle on Apr 27, 2022, 10:39 AM
Hey there,
Thank you for reaching out to us. Yes, it will fit that sump.

Tank 35 x 25 (13.8”x9.8”)
Skimmer Dimensions: 10.6" x 6.75" x 19.75"
Answer by: Matt Lucero (BRS Staff) on Apr 28, 2022, 8:11 AM
Will this work in max of 7inches of water?
Question by: Mike on Jan 19, 2022, 9:04 PM
Hey Mike, great question! The recommended sump water height for these is 7-8".
Answer by: JJ (BRS Staff) on Jan 21, 2022, 12:43 PM
Have a smaller sump with a 9x7 sump chamber. Is there any orientation that will allow this skimmer to fit?
Question by: Richie Farmer on Feb 2, 2020, 8:33 AM
Hey there,

Unfortunately with those dimensions it would not fit in any orientation.

Take care
Answer by: Thomas Billington on Feb 6, 2020, 12:21 PM
Could the unit be supplied with a water source plumbed into the venturi inlet instead of through standing water from the sump? I'm curious if I could use it in my aquaponic garden. Many thanks !!
Question by: Myron on Jul 16, 2016, 10:55 PM
Hi Myron,
If you are looking for a skimmer that has a feed for the water intake we would suggest looking into a recirculating skimmer since they require some type of source to be fed into the skimmer from another pump, or overflow. By plumbing a source water into the intake of the venturi you may change the characteristics of how the pump runs and pulls air.
Just an FYI the protein skimmers we carry are designed to work with saltwater only and will not be effective in freshwater.
Answer by: Charlie on Jul 18, 2016, 10:36 AM
Will this be good for my 55g tank?
Question by: Lorenzo Bafumi on Jul 4, 2016, 9:47 PM
This will work great with a 55 gallon! Will handle a heavy bio-load!
Answer by: Connor on Jul 6, 2016, 2:26 PM
Will this work on a 90 gal with 20 gal sump?

Question by: Jordan Nelson on Mar 31, 2016, 3:10 PM
Great question!
This could work with a very light bio-load not too many fish, most likely around 4-5 and a lite feeding. Feel free to let us know if you have any further questions!
Answer by: Connor on Apr 5, 2016, 2:34 PM
What is the recommended sump water level for this skimmer?


Question by: Mike on Feb 7, 2016, 7:10 PM
Great question!
This skimmer will work well in 7"-9" of water. Feel free to let us know if you have any further questions!
Answer by: Connor on Feb 10, 2016, 6:09 PM
Hi guys. Sorry if this is in a previously asked question, but the "view all questions" link is broken. I just installed my new Reef Octopus NWB110 and I'm not sure how to set the gate valve. The manufacturers instructions were kind of unclear about that. I initially set it so that the foam reaches the very top before it falls into the collection cup. Is that correct? What is the ideal way to set the gate valve? Thanks for the help.
Question by: Benji on Aug 28, 2014, 1:19 PM
Hi Benji,

I apologize for the broken "Questions" feature, I'll have our web team look into it if they are not already aware of the issue.

For the initial water level setting I would set it at the wavy line on the skimmer body and adjust from there as the skimmer breaks in and you can determine how the skimmer behaves in your particular set up. If you are not getting any skimmate in the cup after 24 hours you can slowly raise the water level in the skimmer until you do at which point you can make fine adjustments to get the desired amount of water/skimmate in the cup. Some people like to skim "wet" (lighter colored liquid) while others like to skim dry (darker colored liquid).

I hope this helps!
Have a great day :)
Answer by: Bulk Reef Supply on Aug 28, 2014, 1:19 PM
What size compartment in my sump/refugium is needed for this? I plan on having it sit in the 1st stage were the water input is, and the output from this would be going into the refugium (2nd stage) of the sump/fuge
Question by: Ryan on Jan 30, 2014, 5:19 PM
Hi Ryan,
The footprint of the skimmer is about 11x7 so you will want to make sure that you have atleast that much space for it.
Answer by: Bulk Reef Supply on Jan 30, 2014, 5:19 PM
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