So I have a 3 year old green terror. He has been through a lot, he has batted hole in the head and an addiction to bloodworms and won both fights. My Oscar seems bored and my green terror does as well. My green terror is in a 40 gallon breeder and my Oscar is in a 75. I know the 40 is a little small for the terror so my question is, should move the terror to a 55 or should I get a 125 and put the terror with the Oscar? How can I keep them happy they both seem lonely