common misconception of reef tanks - getting a lot chromis won't mean they will school together - schooling is a survival instinct in natural reefs against predators. Unless you a get a predator in there they wont school but instead they will get territorial and start playing "survival of the fittest". They work together when there is a threat - when there isn't threat its every fish for himself.
They might swim together for a bit in the beginning but unless you have a giant tank you will be left with one in a couple weeks/months.
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