Yup. I found the same thing. The LG BTA I bought had a stow away anenomie crab. The clown booted the crab out and it had to fend for itself in this tiny little BTA that came on a piece of base rock.
I finally sold the crab since it would actually straddle the entire anenomie. It was sad looking really. The crab went from a beautiful 4 story house with garage, rec room, sport court.... to a 1 bedroom loft.
Just couldn't see keeping him there.