I'm setting up a 55 for some discus. I was planing doing a half inch of white sand and some driftwood. For filtration I'm using two marine land 200's (rated for 50g each) and a 100g canister. I figured doing a 30% water change twice a week. As for fish I was planning putting 4 discus, 4 clown loaches, and maybe some gold rams. If I don't add any tank mates, how many discus could I be able to have? Input is appreciated