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My Zebra Danios are nipping! I think I know why too, I only have 4 of the danios in the tank and that isn't enough for them to school. I think i might pick up for more. .I hope the other fish can last another night of nipping =((
Danios are known nippers. You can try adding more, but it may not help. One of my angels was in a tank at the LFS with danios and her fins were all shredded...I brought her home and fixed her up though.