I'm doing a 7.5 nem + LPS(frogspawn, hammer, hopefully duncan and torch) tank, and I saw some of these in my LFS over the weekend. Maybe 2-2 1/2" diameter on the tentacles...how much bigger do they get? Were these teeny-tiny babies? I'm not worried about fish eating, the only fish going in this tank are ones I can afford to loose(and if it happens too much, the fish idea will be abandoned, lol).