It appears they are! Many thanks. ****it it appears they aren't fully aquatic. Not sure how they've survived this long. I might just take them out and stuff them in a little bowl for now until I construct some sort of platform for them to relax on.
Not exactly for shrimp, or crabs but it works great for crabs, turtle floating lily pad comes in different sizes and you can keep the water level down a couple inches and tape up any holes where the airlines and tubes come in, or they could crawl out.
My cute Tangerine Tiger shrimp, couldn't remember if I posted them or not. Now in the jungle shrimp breeding tank with Blue Velvet tank.