Hes alone and waters just fine, he gets a 75%+ water change every week, hes about 6-7in in a 55gallon. He's just been a jumper since I first got him, he was jumping in the bag on the way home and since hes been with me, it's just as he grows he gets more power behind his jump. He used to jump and hit the lid and just make noise now he hits the lid and gets hurt, nothing major ever but I just don't like the fact that he keeps getting injured.