i have a five inch red devil. he is getting way too big for his 20!! gallon tank.. he needs a new home. and no pet stores will take him. If anyone is interested i will post pics. He is aggressive like all red devils. But he also gets along with other fish somewhat. I have a 3 inch jd with him and a 4 inch uro. all in a twenty gallon. he beats up on the uro alot.. i might add that it isnt a he. it is a her. i think. ha. so if you wanna help this fish out let me know. and i will post some pics. its a great fish.