+1 to Hobbs, The Celebes Blue Eyes are great flashes of yellow (as mentioned) that can go in a 30 without issue. I had them in as dithers for Kribs for a while when I was testing to see what would work for dithers. They were to fast for the Kribs but also generally stayed top level and were awesome fish. I really dont think you have stock room for them though. You need to fill out your schooling fish.
FW: 1 45gal, 1 40gal, 3 10gal, 3 30gal all community tanks of different species
Sw: 1 55gal, 1 30gal show, 1 29gal show, 1 20gal and 2 10's