i think i'm over feeding my fish but i am not sure how much to give them. i feed the the small NLS pellets. i have about 15 fish in my tank. about how much should i feed, maybe in teaspoons? i know some people say feed as much as they can eat in 45 seconds but some of my fish are faster more aggressive eaters than others so if i feed to little the shyer won't get any but i think i am feeding to much cuz there is a lot left on the bottom after and i don't want my fish to get sick from over eating....what should i do?