My friend gave me a goldfish. It was in a 2gal and I felt bad for it so I put it in a 15gal I have. Well now I am not sure I want the goldfish. It is not going to live a good life in the 15gal. It produces more waste than the bacteria can handle. I even used twice the dose of bio spira and it didn't help the nitrites go down. I don't really have feelings for this fish but my friend does. I can't give it back to her because she lives in GA. I know it isn't going to have a good life if I take it to a LFS. I can't put it to sleep even in the most humane way. I just don't know what to do with it. What would you do?