My roomate stopped taking care of their fish. How can I help it get better?
My roomate has been struggling with some things in their personal life and due to that they haven't been taking care of their fish for the last few weeks. Ive been keeping up with feeding him and assumed they would do water changes but i guess not. He started off in a 2 gal tank with a filter and 50w heater. Got upgraded to a 7gal tank with built in filter and we had a 50w heater and live plants. That tank cracked so my roomate put him back in the 2 gal. He's been in there for about 2 weeks now. I found them a 5 gal tank on marketplace and it has been sitting for a few days. Today I finally went and got some gravel for the tank and transferred him over to the bigger one because I noticed his fins were in really bad shape. I took some plants out of my tank and put some in the new one for my roomates fish but its not that much for now. He already seems to be spreading his fins more and flairing them out. But they look extremely damaged. What should I get to treat him and how do I help him get better? I was reccomended safe guard by sea chem and also kanaplex. But im not sure if I should have kept him in the 2gal hospital tank and treated him or treat him in this bigger tank. I want the Lil guy to do okay 🙏🩷