I am in the process of setting up my 125 gallon tank, 6x2x1.5. I have 7 clown loaches, 8 serpae tetras, a rubber lip pleco, and 5 will be 6 angel fish. My question is can I add 1 or 2 discus? I think they are gorgeous fish, but don't want to set up a separate tank for them. Thank you.