They are housed in one of those white breeder nets. There is some grass (I think it is called microalgae) in there, so there are plenty of places for them to hide. I don't have any substrate in there though. I haven't really counted the shrimp because they are so hard to find in all the grass, but the cuttlefish aren't going after any of the food that is near them when I have been in there. Some shrimp have actually bumped into them and they still won't get it.
They appear very weak and unable to swim. When they do swim they look like a plane spiraling to the ground out of control. Then they will slowly float back up to the surface. I keep checking on them because they look like they are dead, but one inked and they both changed colors. Still neither of them looks like they can control their swimming (which is what really worries me).