Hi,
The condy anemones tend to move around until it finds a place it likes. Does your power head have a sponge cover over the intake. If not going to a pet store there are round sponge like filter sponge which has a hole in the middle that the power head housing fits into. The only problem you have to check it at least twice a week and clean it out. I hope this info it's helpful to you
Good Luck!