Hello forum. I have a 125 gallon tank that's looking a little sparse. Current inhabitants are a 3 inch Oscar, appistogramma Aggazzii pair and lone Cory cat, I'm picking up the black ghost knife tomorrow from my lfs. He's about 6 inch. Filtration is an aqua clear 110, (I'll be buying a canister to go along with it eventually) and I do 50% water changes once a week. What bottom dwellers can go with these fish and not get eaten? Everything except the Oscar is in there temporarily.