A school of harlequin rasboras or a school of cherry barbs or both. I will be setting up a 29 gal. My young angel fish Sparky is a small koi angle and will be the centerpiece fish with a school of 5 harlequins, and 8 cherry barbs, and 1 L144 pleco female, and 1 blue eyed yellow ancistrus bn female pleco. I am combining fish that I already have. Sparky is currently in my 20 gal with 11 neons, 3 embers, a male ABN pleco. He would have a feast if he grew up in this tank. He he . Hubby is recovering from shoulder surgery So when he can lift then we will set up the tank which is currently siting on the floor. Alison