02-10-2007, 09:16 AM
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It is fine for algae to grow, Diatoms grow in low lighting and high silicites. Diatoms are normally the first algae that grows in a tank, they pose no threat to the fish except the fact that they look bad. After a few weeks, green algae takes over the diatoms. Both diatoms and green algae are loved by otos, you can clean the sides of the tank with an algae brush if you dont like the look of it, but only one side, not all over the tank.