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Thank you for replying. They've settled down now thankfully, hoping it stays that way! The fish that were being chased are quite round so maybe they are carrying eggs. I'm not sure if they're short or long finned or a mix, they were all purchases together so I expected them to be the same but...

Hi, my son is 14 and I am supporting him in taking care of his fish. He has 7 zebra danios, 14 neon tetras and 4 sucker fish (Can't remember the name of them) in a 126L tank. All have been getting along fine until this morning we've noticed that 2 of the smaller danios have become extremely...