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I think I might be over feeding my fish, and there are food left at the bottom of my tank I heard someone say that it could turn intp toxi (sorry not good at spelling) what should I do?

I don't know what as happened to your fish but the same has happened to mine, you should put the sick fish in another tank

I have four goldfish in my tank and one of them always is at the bottom of it and I think its tail is broken or something because once he got stuck in the filter