In the past when i used to buy lots of delta tailed guppys(long tailed ones) their fins would rip when the water current from the tank filter is too strong, lowering the strength of flow helps their fins to heal much faster and im sure it'll do good for your long tailed danios tooLynz781 said:Common as muck up here in Scotland! One of my zebra girls has a tattie tail at the moment but I'd prefer to leave it to heal naturally. Hope It's just down to the males chasing for some fun. I've found the long finned variety just get injured more easily with their type of fins![]()