Your diatom bloom once it appears will happen over the course of a few days starting off small then gradually cover almost the entire tank it will be brown in colour then you can add your CuC which will start eating the bloom and then start another diatom bloom that will start another cycle. This is common to almost all new tank setups.
Diatom blooms basically start the seeding process if you will of bacteria in the tank which the inhabitants of the tank require
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 My aquarium is nothing but a smorgasbord for my cats.....
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