I have blue leg hermits, red leg hermits, orange leg hermits (these get bigger than I thought they do), red mithrax, emerald mithrax, rock and gorilla crabs. I also have this amazing white crab with a blood red spade looking patch on its back. I have never seen this one pictured before, but it is in the mantis tank until I get the mantis and it become food. I really wish I would have pulled out the camera the few times I saw it because it is stunning.
Other inverts we have include rock anemones, many many feather dusters, 2 coco worms, skunk cleaner shrimp, one pepermint shrimp per tank(3) a beautiful pink and black cucumber, and a yellow cucumber. We also have a pet bristle worm that we watch that is around 6-7 inches long, at least that is what we think it is because we have never seen it fully extended from its rock. We also have a red serpent star and a marbled red/black brittle star. We also have 3-4 urchins.
I have to say I think the inverts are my favorite part of the aquariums we keep because they just sometimes seem to come from nowhere and you may not see them for months.