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Reef Octopus LR-200 Macroalgae Light Reactor - 8 inch


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Item #: CV2623

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The Reef Octopus Light Reactor is a natural filter which utilizes macroalgae like Chaetomorpha to absorb and remove algae-producing nutrients from your aquarium`s water. As macro algae grows, it will consume nutrients in the water. Once you harvest the macro algae, the nutrients are then removed from your system.

Besides being an all natural approach to filtration, algae reactors also provide a safe haven for copepods and amphipods.

The Reef Octopus Light Reactor`s unique triangular waterproof LED light (IP67 Certified) strip inside the reactor maximizes light exposure for the algae with 360 degree coverage, aiding growth and nutrient consumption. The close proximity of the high-output LED strip gets as much light to the macro algae as possible and quickly grows the macro algae.


  • A unique and safe method of natural filtration
  • Greatly helps remove algae-producing nutrients from water naturally
  • Perfect safe haven for copepods and amphipods to reproduce and naturally feed the aquarium
  • Unique Triangular LED Strip for 360 degrees coverage
  • Inner LEDs provide safe high quality lighting
  • Stabilizes pH and and lowers dissolved CO2 levels
  • Low wattage and safe operation with heat sink
  • Integrated algae containment plates
  • Can be installed externally or in-sump


LR-150 Light Reactor

LR-200 Light Reactor

Tank Volume Rating: 50 - 160 gallons 100 - 260 gallons
Body Diameter: 6 in 8 in
Total Height: 20 in 20 in
Footprint: 9 x 8 in 11.2 x 10.5 in
Input Fittings: 5/8" Barb
1/2" PVC
3/4" Barb
1/2" PVC
Output Fittings: 5/8" Barb
1/2" PVC
3/4" Barb / 1" Barb
3/4" PVC
LED Power: 20w 20 w
Circulation Pump: AQ-1200 
  • Dimensions: 4.5 x 2.4 x 3.6"
  • Power: 15 watts
  • Head pressure: 4` max head
  • 340 max gph
  • Dimensions: 5.3 x 2.8 x 4"
  • Power: 45 watts
  • Head pressure: 7` max head
  • 580 max gph
*The size of light reactor your aquarium requires will vary depending on the amount of nutrient reduction needed. We suggest using the largest Light Reactor you can fit in or around your sump.

5 Stars


Reviewed on
August 20, 2019

Yes, I would recommend this.

Nutrient control made easy

Pros: Comes almost entirely assembled; you can dim the light

Cons: Nothing yet

Controlling nutrients in my tank has been a constant battle and I'm always wary about adding different supplements or using chemical media to help reduce them. I like the idea of natural nutrient control but didn't have space in my sump for a scrubber. I decided to try the Light Reactor since it can also be run externally. It was easy to get up and running, it's basically already put together when you get it. I'm already seeing the difference in my tank after only a few weeks. One cool feature that I haven't seen mentioned elsewhere is that you can actually dim the light inside. So if you need to acclimate your macroalgae to the light like I did they make it easy to do so. This is my first Reef Octopus product purchase and it won't be my last. I am very pleased!

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