I have 7 neons and 10 rasboras in a 33 gal. tall hex. My neons only eat the green flakes of Tetra Min and spit out the other colors. I gave them Tetra min micro pellets, blood worms, Vibra Bites and they are all too big so when I try to scrunch them up, they become like dust. The one's that are the right size get chomped by the Harleys. I'm afraid my neons aren't getting enough food. Help!