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Can I cover my tank with fish in?

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I have an overgrowth of green algae all over my tank, so im covering the whole tank for 5-7 days so no lights enters.

Is it okay to do this while fish are in?

And id appreciate more tips to how to get rid of green algae. Its all over my glass, plants, and ground.

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Yes, it's absolutely fine to cover the tank up and do a blackout.  I use 2-3 towels for this.  One on the back of the tank, one on the front, and potentially one across the top if you need it.

Definitely try to scrape whatever you need to and adjust the lighting a little bit.

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