Stain on HOF

[eugenecj]

Hi guys my filter are starting to have brown stain.. do I wash them off?Attachment 41801

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[diazman]

Just rinse off with water and scrub it with a sponge.

[eugenecj]

Just rinse off with water and scrub it with a sponge.

I'm keeping crs will it affect them? Thanks in advance.

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[Berny]

those are ok la, either its algae or bb, wont affect much

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[diazman]

I'm keeping crs will it affect them? Thanks in advance.

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Wont affect them. Like berny said, its either algae or bb. You can wipe it off with the aquarium water during water change if you do not want to rinse off using tap water.