Originally Posted by Laird-and-Dad
Ok. How do I treat diatoms?
Turn off the lights. The picture looks more brown than red to me, but cyanobacteria is possible for sure. You said the tank was not cycled, so I'm assuming the sand is new and whatnot. If it's red I'm leaning toward the cyanobacteria.
Diatoms need light to live, or they go away on their own in a few months.
Cyanobacteria isn't as simple.
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