bought some geen sea mat yesterday and i cant get it to stay in any one place.instead of it growing on a rock the whole colony seems to be attached to a tiny piece of shell with maybe a 1/8 inch piece sticking out.no matter where i put it the power heads just seem to keep blowing it slowly around the tank.can i try to glue this piece to something?if so what kind of glue do i use?thanks for any help.