I am a total n00b, feel free to make fun of me if this is an idiotic question. I searched first, didn't come up with anything, so here goes.

8G BioCube, about a month old. Good quality cured rock from LFS, tank cycled for 2 weeks, my levels all went back to zero. Ph 8.3, Alk in the normal range, water 78 degrees, SG at 1.022, ammonia 0, nitrites .05, nitrates 0.

My 2 red leg hermits, which I got about a week ago, were doing fine, but as of a few days ago they have stopped moving around. One has lost a claw and has been sitting, alive, in the corner of the tank by the heater. The other just sits in the same spot on the LR. I did notice a hitchhiker crab of some kind (tried to ID it but didn't get a good look) in my LR the other day, a little bigger than the biggest hermit, with pointy claws. Could my hermits be afraid of it/is that how the one lost his claw?

Again, sorry if this is an epically retarded question.

to nano-reef.com

You should get an ID for the hitchhiker crab. Hermits will sometimes also attack each other.

Your specific gravity is a little low. Aim for 1.025-1.026 (evaporation is the best method).

get the hitchhiker out of the tank now