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6 baby fish of mine died...They have white stuff stuck to their heads?

So I had 12 baby fish. 6 of mine died overnight, and 2 died when I caught them. Now I have 4 left. Where did I go wrong. Temperature is perfect, I have a filter and I put them in something like a breeding box sort of. They had white fuzzy stuff on their heads. (The dead ones) Maybe it was ich. I'm not sure. please help There already dead, and I changed the water

Public Comments

1. Its isn't ich hurry and treat it for fungus cause thats what it is. Treat it now before all the others die.
2. you should change the water, could be a disease, or fin rot ? also it could be ick ( as you mentioned) the dead ones could just have the fuzzy stuff because of being dead too long,hope this helps!