I currently have a 20g tank with 1 (about 1in height) angelfish, 1 hatchetfish (re homing soon), 4 neon tetras, and 4 cory aeneus. I was wondering if I could switch the hatchet for a German Blue Ram. I am adding many plants soon to give hiding places. The angelfish gets along with all my fish with no nipping, he will even let the corys and tetras swim next to him and bump into him. I can re home him but I would rather not as angelfish are one of my favorites. My water is: 78-82F, 7.5PH, 0 Ammonia, 0 Nitrates but 5 Nitrites. I plan on dealing with my nitrites issue with 50% water changes everyday before doing anything else to the tank. So my question is if I can keep 1 angelfish, 1 GBR, 4 corys and 4 neon tetras in a 20g planted tank? Thank you.