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Chaetomorpha Macro Algae

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Chaeto is a green macroalgae that grows rapidly, cleaning your tank by consuming nitrates and phosphates for easy nutrient export. It can form a tangled mass that spreads over the substrate. It maintains its shape well when kept in large masses. Fraggle Reef Clean Chaeto is quarantined and kept in its own system to remove any unwanted parasites, and hitchhikers.

Chaeto grows quickly and cleans your tank by consuming excess Nitrates & Phosphates for easy nutrient export. Balance your nutrient levels and watch your in-tank ecosystem thrive!

PLEASE NOTE: We go to great lengths to treat, quarantine and remove any unwanted parasites, hitchhikers, and other organisms from our macroalgae. However, we do not guarantee that this item is completely and totally free of anything unwanted. This is because sometimes spores, eggs, etc. can remain viable but not visible, despite our strict quarantine procedure. As a result, we always recommend that you properly quarantine anything new that you are adding to your tank.

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Chaetomorpha Macro Algae

Chaeto algae (Chaetomorpha linum) is hardy green algae commonly used in saltwater refugia & algae scrubbers. It is especially suited to algae reactors, where large masses can be kept with minimal packing due to its rigid structure.

It grows in long, curvy, sturdy strands that create a framework with ample inner space that provides shelter for a diversity of small, beneficial benthic creatures such as copepods, amphipods, isopods, etc. (it looks much like a green scouring pad!).

A fast grower when provided with bright full-spectrum lighting, this distinctive alga is valued by marine aquarists the world over for its ability to take up copious amounts of nutrients from the water column.

When the grow space has nearly filled, you can very easily harvest and discard a few chunks to complete the process of nutrient export. Because of its tough structure, it may be used in the main tank with fewer concerns that it will be consumed by herbivores. Chaetomorpha Macro Algae does best housed in a refugium with moderate flow and good lighting. If you cannot provide enough flow to cause the Chaeto to tumble then you can manually turn it over every couple of days to prevent dead spots and die-off.

Chaeto forms a tangled mass that can spread over the substrate and tends to maintain its shape well when kept in large masses. As a result, copepods love hiding out in the ample interior spaces of the chaeto. Chaetomorpha Macro Algae uses the combination of Nitrates, Phosphates, and strong lighting to grow. We have found that Chaetomorpha Macro Algae does best under horticulture-specific lights favoring red and blue channels. We grow our Chaetomorpha Macro Algae under grow lights.


Care Level: Easy
Lighting Requirements: Moderate to high (PAR 150-300+)
Water Flow: Moderate
Aggressiveness: Peaceful
Range: Grown in California
Family: Chaetomorpha Spp.
Water Conditions: 75-80° F; sg 1.024-1.026 (1.025 is ideal); pH 8.1-8.4 Ca 420-440 ppm, Alk 8-9.5 dKH, Mg 1260-1350, Nitrates >5 ppm, Phosphates, > .01 ppm

EU Plant Passport: A, Chaetomorpha Spp B: GB-131109 C: Date D: GBContinual production of nitrates and phosphates are required to keep Chaeto healthy and growing.


Chaetomorpha Macro Algae will not do well in a system that already has 0 Nitrates and 0 Phosphates but will thrive in systems with elevated levels. Fraggle Reef uses and recommends dosing pumps to automate the dosing of additives and keep your levels more constant.


A dosing pump can alleviate the chore of manually dosing your aquarium with Ca, Alk, & Mg 2,3, or 4 times per week and will benefit your aquarium by keeping your levels constant through frequent small additions of Ca, Alk, & Mg.


Our tanks all progressed when we switched from 3 manual dosings per week to 70 automatic dosings per week and we got a lot more work done. Acclimatizing your new corals is an important method to make sure they survive and thrive in your system. Click here for more information. For all your various converters, calculators, supplements calculators click here.

Additional information

Weight1000 g

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