Reef Octopus

Classic 150EXT 6” Recirculating Protein Skimmer

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BRS Recommended for tanks up to:

Heavy Bioload (Most Common) - 100 Gallons

Medium Bioload - 150 Gallons

Light Bioload - 200 gallons

External skimmer powered by Aquatrance 2000s pump with an improved venturi design and pinwheel impeller. Built with high quality acrylic. Wedge pipe output allows for more adjustment of the skimmer compared to ball valves. ½” clearance required to remove collection cup for easy cleaning.

Footprint - 12.2" x 10.4"

Height - 25.6"

Feed Pump Required - 200 to 400 gph recommended


pdf Classic EXT Skimmer Setup Guide


The Classic 150EXT skimmer requires a feed pump to feed water to the skimmer. The recommended maximum flow rating for this skimmer is 400 GPH. These numbers are based on zero back pressure on the output plumbing. If you add 90° bends on the plumbing back to a sump you may need to back off the amount of water being feed through the skimmer. We recommend that you use a ball valve inline from your feed pump to the skimmer allowing you to control the water flow.

  • High performance venturi air injection system
  • Modified cone neck design designed for easy transition of micro bubbles into cup
  • Requires a feed pump or plumbed from an overflow to inject water into skimmer
  • Can be in sump or external
  • Metric plumbing parts.
  • 1 year warranty on skimmer and pump


Note: A feed pump is required that can flow around 1.5 - 2 times the systems volume. We suggest a pump around 200 - 400 GPH, and particularly like the VarioS 2 Controllable DC pump or Sicce Syncra Silent 1.5, we also highly recommend a gate valve to help control and fine tune the flow of water into the skimmer from the feed pump.


Filtration Handling

Well Stocked Tank - Rated up to 100 gallons

Medium Stocked Tank - Rated up to 150 gallons

Light Stocked Tank - Rated up to 200 gallons


Skimmer Specifications:

  • Body Diameter: 5"
  • Neck Size: 3"
  • Foot Print: 12.2" x 10.4"
  • Total Height: 25.6"
  • Output Size: 40mm - 1.25”
  • Input Size: 1/2" Union/5/8" Barb


Aquatrance 2000s Pinwheel Pump Features:

  • Air Draw: 720 L/H*
  • Power Consumption: 18W

*Aquarium set up will determine air and water results.


What's Included?

  • Classic 150EXT Protein Skimmer
  • Aquatrance 2000s Pinwheel Pump
  • Output Gate Valve
  • Metric to Standard Adapter
More Information
UPC 6950291202994
Skimmer Type External, Recirculating
Capacity Light Bioload - Up to 200 gallons
Medium Bioload - Up to 150 Gallons
Heavy Bioload - Up to 100 Gallons
Dimensions 12.2"L x 10.4"W x 25.6"H
Diameter 5.9" Cup, 3.2" Neck
Output Size 1.25" (1-1/4 in.)
Air Draw 719 LPH
Flow Rate 750 GPH
Pump Model Aquatrance 2000S
Pump Rotor Type Pinwheel
Variable Speed No
Power Type AC
Power Consumption 18 Watts
Warranty 1 Year
Additional Notes Feed Pump Required - 200 to 400 gph recommended
½” clearance required to remove collection cup for easy cleaning.
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Product Questions

Can you use ozone with this skimmer?
Question by: Daniel Gomez on Mar 9, 2020, 5:16 PM
Hi there,

Yes you can use Ozone with this skimmer, it has an input on the silencer.

Take care
Answer by: Thomas Billington on Mar 11, 2020, 1:42 PM
Should I glue the pipes and fittings of this together for external sump use?
Question by: Will on Jan 30, 2018, 12:31 AM
You will need to use PVC Cement if you need a leak free installation.
Answer by: Charlie on Jan 30, 2018, 4:38 AM
Where should I adjust the bubbles to in the collection cup?
Question by: Bill on Jun 27, 2016, 1:56 PM
Great question! I normally set my bubble level just under break between the body of the skimmer and the collection cup. Once it is broken in, you can adjust as necessary! :-)
Answer by: Randy on Jun 29, 2016, 6:35 PM
Will any of the auto neck cleaners work for with skimmer ?
Question by: Stephen on Jun 25, 2016, 1:34 PM
The 150 neck cleaner will work for the 150 skimmer.
Answer by: Connor on Jun 29, 2016, 6:45 PM
How much clearance do you need to remove waste cup?
Question by: Bill on May 17, 2016, 7:53 PM
Great question!
You will need around 1.5" for easy clearance of the collection cup.
Answer by: Connor on May 18, 2016, 2:21 PM
If I set this pump up outside of the sump what are the water input and output connections needed?

Question by: Justin Taillon on May 9, 2016, 7:47 AM
Great question.
You will want a feed pump around 250 GPH to connect to the input using 3/4" soft tubing. The water on the output of the skimmer will be hard plumbed with an adapter for 3/4" hard PVC.
Answer by: Connor on May 11, 2016, 5:34 PM
what pump(s) would you recommend? Are two pumps needed for this skimmer? Also, please confirm skimmer can be in sump
Question by: Jason on Mar 24, 2016, 6:53 PM
Great question!
You will want a pump around 1.5- 2 times your system volume. Typically around 300 GPH. A great feed pump is the Sicce syncra silent 1.5. I have included a link below. This is the only additional pump you will need. This can be run internal or external. Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 25, 2016, 9:16 AM