i hope that you are not going to put the bgk in with the discus. bgk are rather nasty fish. need to have some type of cover during the day for them. at night is when they do their nasty business. had a friend of mine that had a group of discus. her son was going out of town and did not want to leave his bgk. since he lived quite a ways away, she had him bring it to her house. wiped out all of her discus.