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So yesterday I got 15 neon tetras for my 25g. Just put 'em in yesterday. Well at the pet store they were schooling pretty tightly. I woke up this morning and they were kinda just all over the place, they looked kinda more relaxed and chill. Like they weren't all schooling together, kinda like in one big group, then one little group not far away. I'm assuming this is normal behavior? Could this because I just have them in there by themselves?