When I brought home our RBTA back in Feb, I put it dead center (nearly) in the tank, in a nice crevice/hole in the LR. It kept floating around over the next hour, so I laid a piece of eggcrate against it overnight and by morning it was attached nicely
It hasn't moved since
Egg crate around the power head or RBTA?
__________________ Wow! That's Crazy! Why would you spend that much and go through all that trouble?