Possibly, but rams might try to hunt. The dwarf crays or large shrimp would be your best chances for success I think, but they also have their own needs too. Most larger shrimp are filter feeders and tend to slowly starve in most aquariums they are attempted in. Large amanos MIGHT work, but there will be an element of risk to any first attempt. If you decide on your fish stocking, build from there and maybe try some ghost shrimp as a test?