When I first got the two giganteas, the lfs owner was not comfortable of handling them. His exact words were "they're all yours." We've became friends through the local reef club so I wasn't offended and rather handle them myself than risk of damaging them. Like an idiot, I handled them with my bare hand. The green one did not pose a problem but I got stung by the purple on the arm and I can still see somewhat of a scar even til now.
When I placed them in the previous tank, I used the aqua gloves. When I had to move them to this tank, I wrapped my hand with clear plastic bag and tried to caress both of them on the underside to make them shrink. Since I didn't want to use any of the old rocks from the previous tank, I had to try to peel them off the rock with my fingernails. I was able to do just that with the green one. However, the purple one was too large and the foot was too much for me to try to peel it off the rock without hurting it. I decided to just take out the whole rock with it attached and put it in a 5 gallon bucket for the transfer. I placed the rock into the new tank. This rock was the seed for my bubble algae and aptaisia. Actually, the aptaisia and bubble algae were already on my LPS so I probably couldn't avoid them either way. I have taken care of the aptaisia with a dozen of peppermint shrimps. They cleaned them up real good. I put 5 emerald crabs and they all hang out on one island. That island has no bubble algae. I guess I'll have to buy a lot more to take care of the bubble algae.
Do not rush when transferring anemones. If they're attach to the rock and you can't get it off, take the whole rock with you.
I have not lost any fish solely due to the giganteas. Sick fish that are weak get blown from the pump into the anemone is a goner.
I have not seen any snail shell near the giganteas either. When I had a red haddoni, under it was a snails graveyard, literally. For that reason, I'm not inclined to keep haddoni anemones.