I've had a goldfish for five months now and he hasn't grown at all over the last three months. He came with fin rot and it comes back every few weeks. My other goldfish I got with him died a few weeks ago with swim bladder disease. Right now my goldfish has spent most of the last five days at the bottom of the tank, only swims around when I spook him, and is taking slow, deep breaths like he may be struggling. I bought fin rot medication last time it got bad (60% of his tail was just gone), but it didn't do a lot. He still has some white spots and he's a little bit bloated. I'm 15, I don't have a job, and my mom doesn't want to spend more money on goldfish medicine. I took the fish in for a friend who unexpectedly won them at a carnival and it was either me or a bowl so I took them. Right now it's the one fish (the size of about 2 quarters, and again, not growing at all) and one mystery snail in a 20 gallon tall aquarium, I do 50% water changes every 3-4 days, but I don't have a proper test kit anymore. Is there any home remedies I can try? I'll do what I can. I've posted about him a few times, but things keep getting worse.