Congratulation on your first fish!Try some frozen fish food like Ocean Nutrition Prime Reef/formula One...much better than flakes.Frozen foods contribute to less waste,more natural and the fish will love you for it.If you want something better to eat the leftovers that hit the bottom,go with Nassarius snails,either the small ones or the larger Tongans.Not only will they eat the leftovers they will keep the sand stirred.