Why is my 10-gallon fish tank full of algae, and how do I fix it?

Question

I have a 10 gallon fish tank and I have about ten fish (plattys,mollys and cat fish not algae eating) and I have algae all over my rocks. How do I get it off?

Angel Alvarado, LVT · Accepted Answer

Your tank may be overstocked which will contribute to excessive algae growth. Other causes include poor water quality, overfeeding, too much light and slow water current. Consider removing some fish to another tank or getting a larger tank. If you choose the latter, it will need to be properly cycled before you move fish. A general guideline is one inch of fish per gallon of water. Use the adult size of any fish you plan on keeping when estimating tank requirements. Put the lights on a timer. A photoperiod of 10-12 hours on and the remainder off should suffice. Increase filter flow if you can. Standing or slow moving water will promote algae growth. For now, you can use an algae scrubber to clean glass and tank furniture. Perform partial water changes and rinse filter media. Use only aged or conditioned water that is temperature matched to prevent stress or shock. Use tank water, not tap water, to rinse filter media to preserve beneficial bacteria in the sponge.

Why is my 10-gallon fish tank full of algae, and how do I fix it?

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