Ok, betta and shrimp are fine if the bettas are not overly aggressive. I have 1 ghost shrimp with my DbT HMPK male and he is fine, they have been together in the same little PetCo stacking containers and the shrimp is left alone. Ghost shrimp WILL disappear merely because of their coloration. He eats leftover pellets every now and then and I have found him munching on goldfish pooh when he was with one. We are getting a few more soon, 2 for each betta.