My mom let me bring a discus home from the pet store.He was in a tank with all sick fish.That was 2 months ago.He is in a 10 gallon tank right now and seems happy.(my mom & i do water changes 3 times a week)He swims around and is not shy at all.My question is can I keep him alone forever.He is easy for me to take care of the way it is.He is about 3 inches from mouth to tail.Thank you , ??? Ryan