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The red colored slime on gravel and rock is called cyanobacteria. It is caused by high nutrients. It can be eliminated by keeping your aquarium water clean, and low in nitrates and phosphates. If you already have it, start by siphoning out as much of it as possible. Then use an anitbiotic product called Red Slime Remover, but UltraLife, to kill the rest. It can be purchased online at www.bigalsonline.com

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15y ago

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