Reef Octopus

Classic 202-S 8" Internal Protein Skimmer

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The Reef Octopus Classic 202-S is an in-sump protein skimmer capable of providing powerful filtration for aquariums up to 265 gallons where sump space may be limited.

  • Refined Filtration at an Affordable Cost
  • Compact Footprint
  • Ultra-efficient Aquatrance 3000s Pump
  • In-Sump Application
  • Turbulence Reducing Super Cone Body
  • Solid Cast Acrylic Construction
  • Bubble Plate
  • Precision Control / Bubble Free Output
  • Efficient & Quiet Operation
  • Disassembles for Easy Cleaning & Maintenance
  • Super Cone Body Size: 8.27 to 5.12in
  • Footprint: 12.4in x 10in
  • Neck Size: 4.7in
  • Total Height: 23.2in
  • Output Size: 40mm / 1.25in


Suggested water depth:  7-9 inches


pdf Owners Manual


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

More Information
UPC 6950291251961
Skimmer Type In-Sump / Internal
Capacity Light Bioload - Up to 265 Gallons
Medium Bioload - Up to 190 Gallons
Heavy Bioload - Up to 125 Gallons
Dimensions 12.4"L x 10"W x 23.2"H
Diameter 7.9" Cup, 4.7" Neck, 8.27" - 5.12" Tapered Body
Rec. Water Level 7" - 9"
Output Size 1.25" (1-1/4 in.)
Air Draw 871 LPH
Flow Rate 211 GPH
Pump Model Aquatrance 3000S
Pump Rotor Type Pinwheel
Variable Speed No
Power Type AC
Power Consumption 35 Watts
Power Cord Length 6 Feet
Warranty 2 Years (pump body), 1 Year (pump rotor), 1 Year (skimmer body)
Gallons Per Hour 100 - 300 GPH
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Product Questions

In how many feet/inches of water should it be submerged for optimal performance. Thanks
Question by: Erik Andrews on Dec 8, 2021, 8:53 AM
Thank you for reaching out. We recommend a water depth of 7-9 inches for the Classic 202-S.
Answer by: William Glenn (BRS Staff) on Dec 15, 2021, 11:19 AM
I have a 120 gallon 48x24 oceanic tank. Just bought a Trigger Emerald 34 sump. Going to running a fuge in the second compartment. My question is would the skimmer be to big for the tank ? I don't want to over skim or my cycle to fluctuate. I want a mix reef with prominent SPS, plus medium bioload fish.

What is a good Spacing for the skimmer pump to suction the water. (How many inches away from the wall) I know the Emerald Sump will have a tight squeeze for the skimmer.
Question by: Pedro on Nov 11, 2017, 8:03 AM
It is almost impossible to over skim a tank, it's just a matter of if the skimmer can maintain efficiency when they are oversized. For this skimmer, you could have a pretty heavy bio-load in the tank and still be ok. When it comes to clearance in front of the pumps venturi we normally recommend 3/4" - 1" of clearance.
Answer by: Charlie on Nov 25, 2017, 10:02 AM
Will this Skimmer fit in a Trigger Ruby sump 36? Looking for a good skimmer for a heavy bio load of 125 gallon that will fit. Kind of limited to this brand skimmer because I want the Reef Octopus Automatic Skimmer Neck Cleaner and do not see the other brands having them. Will the ANC with 200 Lid fit this sump?
Question by: Brenden on Jun 24, 2016, 2:35 PM
Hey there! It looks like the skimmer footprint is 12.4in x 10in and the sump skimmer chamber is 17.5? x 12.5?. According to those dimensions, it looks like it will fit! :-)
Answer by: Randy on Jul 1, 2016, 9:50 AM
Will this skimmer fit in a 12 inch by 13 inch area?
Question by: Ryan on Jun 12, 2016, 6:04 PM
Great question! The product specs for the footprint is 12.4in x 10in. So it will fit in a 12" x 13"! :-)
Answer by: Randy on Jun 15, 2016, 10:10 AM
The manufacturer recommends this skimmer for up to 265g, what does BRS rate this? I currently run a 150int on my 125g with a heavy bioload and am looking to upgrade.
Question by: Jeremy Krolak on May 4, 2016, 8:50 AM
Great question!
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.
Answer by: Connor on May 4, 2016, 3:15 PM
first question. all other skimmers there is a brs rating for the skimmer not this one could you give you tank size recomendation for this skimmer? 2nd says total hight is 23" how much space should there be to get the cup off? building my own stand and wanna make sure can get it off. 3rd gonna be on a 120 with 55 gallon sump would you recommend this product or can you give me another option in this price range? ty very much sry so many questions.
Question by: bj on Mar 16, 2016, 4:31 PM
Great question!
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!
Answer by: Connor on Mar 16, 2016, 6:58 PM
what is the difference between a internal and external pump beside the given one is inside and other isnt
Question by: john on Jan 25, 2016, 8:55 PM
Great question!
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!
Answer by: Connor on Feb 3, 2016, 12:36 PM
will this fit my 50 gallon sump 12" by 48"
Question by: jm on Dec 21, 2015, 3:50 AM
Great question!
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!
Answer by: Connor on Jan 6, 2016, 5:51 PM