I bought the anemone. It is a GBTA, I slowly push in the sides with my nails until it totally unattached by itself, it left a little slime, which did not seem to be part of its foot. I hope it was not harmed during this process. I was just afraid it would get trapped there and wont be able to get out cause the flow. So next time i should just leave it stuck between the surface skimmer and intake spot?