My mom had recently bought my 10g Tank from me since I am sorta getting out of the hobby for now. Any way she had bought four Comet Goldfish and now here are the problems. One of them has a fleshy swollen mouth and enflamed gills, the other is always at the bottom barley moving(sometimes he will move) and it seems as if it is dieing. I dont know what the parameters are since my mom didnt buy a test kit. I have been doing 10% water changes every day to keep things in balance. I cant get pictures at this point in time. But what should I do to keep things from getting worse? My mom doesnt want to sell them and she only says when they get bigger then I can sell them but I dont think they will live long enough.