Amanos get pretty huge, but I would still think good sized Angels will pick them off. If ya want to try shrimp in this "fish" tank....toss in some cheap ghost shrimp. But even with enough hiding places and such, shrimp will most likely become a nice snack for your fish. Can you imagine the stress your shrimp will be in with this kind of setup? *imagining a guppy in with a tank full of sharks or pirahnas* 