ive been feeding my betta "bettamin tropical medley". He used to love the stuff, eating 4 or 5 flakes twice a day, but for the past week he barely eats, maybe 2-3 flakes a day. I never feed him on Sunday to help clear his system, but why would he suddenly stop eating as much, or is 2-3 flakes a day (they are small flakes) a usual healthy amount