They are actually diatoms. Completely normal for a cycling tank. They will go away on their own, as mentioned, as soon as the tank catches up in bacteria to kill them. Don't be surprised if they all disspear within a days time. Your clean up crew may or may not touch the stuff...
As long as your tank is cycled, 0 ammonia, 0 nitrite, preferably less than 10 nitrate you can add the clean up crew.
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