I have recently purchased a fancy tailed guppy and 3ghost shrimp for my tank. They are the only "fish" in my tank right now, but I have a problem. The shrimp are doing great, running around eating, all that good stuff. The guppy on the other hand, will not eat. I have Nutrafin Max Complete Flake Food, and it is supposed to be for all tropical fish. I have tried feeding him in the mornings and at night, but he just sits in the middle or bottom region of the tank when I put the food in and watches it fall to the bottom of the tank...Please let me know if there is anything I should be doing, he hasn't eaten for two days now.