Hi all, I have a 55 gal planted community setup and a 10 gal setup with a single dwarf gourami. My question is regarding the 55 gal tank. Currently in the tank, I have: 1 African butterfly fish (presumed male due to anal fin shape) 5 Danios (4 long-finned leopards and 1 zebra) 6 Cory cats 3 Anacharis bunches planted and 1 floating I have a 350 Penguin biowheel filter and I do 20-40% water changes weekly. I use conditioned tap water, so the tank has very soft water with a stable pH around 8.2 and temps around 77 F. I'd like the pH a littler lower (at least below 8, ideally 7), but I don't want to use chemicals and have an unstable or quickly changing pH. The tank has been setup since early March, so it has been cycled and has steady water conditions (very low nitrate, no nitrite). I have two driftwood pieces in the tank (one large and one medium), and even after soaking in hot water for 3 weeks, they're still leaching tannins. They've been in the tank for about 2 months, and have brought the pH from 8.4 to 8.2 in that time. Hopefully they'll continue to slowly lower it until it's more ideal. I was planning on having an African themed tank with a Kribensis focus, but I've decided to switch to a blackwater theme as it seems the water conditions favor that setup (I know, mixing fish from different continents is not natural). Again, pH is a little high, but it's relatively stable and all the fish I get are local and seem to be adapted to these water conditions. My question is, would angelfish be safe to add to this tank setup, or will they cause problems with their aggression? I have a friend who is looking to sell his 4 medium-sized angelfish. Currently they're all housed in a 29 gallon community tank, which seems too small, but he says they all get along in there. He'll auction them off soon if I don't want to buy them, so they won't stay in the 29 gal long. Would 4 angelfish be too much for my tank? Would 2 be the better choice? Because I only have a 10 gal tank in addition to the 55 gal, I wouldn't be able to move 2 of the angelfish if the other 2 paired and started picking on them. I'm leaning towards just 2 angels. I've looked a bit into mixing African butterfly fish and angelfish. From what I've read, it can be done successfully. My butterfly has no aggression issues with my Danios, and he stays at the surface all of the time. He has a voracious appetite (bloodworms, crickets, brine shrimp, mysis shrimp, and flakes), but he has never eaten one of my Danios and he never bothers them when feeding.