Got one in a 55 gal.
Been there over four months.
Has NOT killed anything.
I say again, has NOT killed anything.
Nothing in the tank bothers it.
He has grown from an inch to about four inches.
Also in the same tank, 8 Albino Corys, that sleep on the bottom, two upsidedown cats about three inches long. One cat sleeps under the same rock as the lobster, different side.
The lobster will move small rocks around and I do blame him for uprooting a couple plants.
He has lost his skin once, at about two inches. The skin was neat, pinchers, legs, tail , everything. Don't know how he got out of it, I looked it over real good. It was neat. Go for it, they are fun to watch.
Good luck.
Edit to add, mine does love bloodworms.