I am very sorry to hear about your anemone getting caught in your powerhead
However, this is an entirely preventable situation. The first thing I learned before getting my GBTA was to make sure powerhead intakes were well protected so wandering anemones will not get caught in them. Heck, I even have guards on my heaters to protect my GBTA.
Here's a video I made one night shortly after we got our GBTA. Camera was set on video mode and to take a flash pic every 10 minutes. I slowed down the speed of the video to show how much and how far an anemone can travel when the lights are out....
(320 x 240 pixels, 2.3 MB, :54 minutes)
http://www.lostmymarblz.com/v-gbta-t...dec-1-2-05.wmv