I'm glad i finally found someone like me. i have my discus mixed with 5 different type of calvus(all about 4inchers), a mated pair of brevis, another mated pair of shelldwellers(cant remember what they are called but they move around like saltwater gobies), rams, kribs, dwarf guoramis, bumble bee cat, clown loach, and rubber lip plecos. they all seem happy and healthy. the calvus will actually school with the discus.