I Used GE Silicone II clear (aquarium safe), squirted it along the length of my pipe, took a paintbrust ($0.88 at WalMart) brushed it around and sprinkled my substrate... well like sprinkles.
But i was using a finer substrate than gravel, but i'm sure if you glob it on it woould work as well.
Or just put the silicone on the pvc, EVERYWHERE, and roll it amongst the rocks.
But i was using a finer substrate than gravel, but i'm sure if you glob it on it woould work as well.
Or just put the silicone on the pvc, EVERYWHERE, and roll it amongst the rocks.