you can turkey baster it off and let it flow our overflow (use a filter sock to catch the bastards.)
my tank is going through its THIRD diatom bloom since starting up 6 months ago. Its inevitable and i have 0 nitrates/phosphates/ammonia, etc. Dont bother with water changes, i find it just feeds them and they grow way faster. Must be trace silicates or something in the water change water.
what i also do is vacuum them out but put the output of the vacuum into my filter sock in my sump so the water is just recycled. then i swap out the filter socks. Unfortunately they are usually back the next day, lol.
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