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My new 20 gallon tank is getting some diatoms on the sand ( of course ). Would a clean up crew take care of these or do they have to go away on their own ?
Nutrients like nitrates or phosphates have nothing to do with diatoms...... they feed on excess silicates typically found in a new system. Once they are consumed, the diatoms will disappear on their own. It can take a few weeks to a few months, and there are some CUC that can help, but you just need to be patient & let them run their course.