My rays love to play on the bubbler discs in the tank but also like to rip them off about every 45 days. I have been siliconing the discs to big pieces of slate so the rays can't drag the discs around. The problem I run into is the silicone doesn't seem to be strong enough and the rays rip the discs off at least every 1 1/2 months. Anything that is tank safe to better stick these discs to the pieces of slate? Elastics don't work either!! The discs have to be siliconed to something heavy other wise the rays will just drag the whole thing around. They are strong enough to move heavy rocks around with ease!

