Hmmm? It all depends on the size of your fish as to "how many flakes for each?" I feed twice a day, a very little amount. In my 29 (listed in my signature) I have various sized fish. I drop a small pinch on top for the bigger tetra's, then crush a really small amount for my Neons and use a turkey baster to get it too them. The cories fend well for themselves. The food is gone in two minutes. Once a week, I feed a cube of either frozen blood worms or
brine shrimp for variety and protein. "Feed as much as they can eat in 2 minutes" has been my rule of thumb. Enjoy!