Okay, so I have a 9 inch CK in my tank, a 7 inch ornate bichir, a 6 inch datnoid and a 6 inch jade sleeper goby in my tank. I have other fish as well, but these are the four predatory fish I have to look out for. I have a shoal of 5 silver dollars and 7 clown loaches in my tank as dither fish to bring motion and color, but I would like to add a shoal of really small fish as the tank still looks bare. I was thinking about buying some zebra danios, black skirt tetras or something like that. Are these fish small enough to be ignored or will they be preyed upon? Are there any other shoaling fish I could put in the tank that stays small, are very active and will be ignored by the predators in the tank?