The green one is probably Pseudosquilla ciliata. They are good tank animals that spend a lot of time digging, looking out at the world, etc. The bigger one is a Lysiosquillid. They are burrowers that never come out onto the surface. With a good pvc burrow, they will entertain you at feeding time, but that is about it. I've had some trouble with deformed raptorial appendages when they molt - which is every three months or so.
Roy