| This COULD be done, however, IMHO, you'd be better off using eggcrate & pvc to allow a better waterflow through the rock. 100% Silicone can be bought at places like Home Depot, but be sure to get the kind that has no algaecides or other poisons in the compound. I'd think that depending on the amount of rock you want to place on the glass, and the spacing of supports would determin the thickness of the glass. 1/4" minimum would be my recommendation. Again pvc & eggcrate would be a better option IMHO, and I will agree with NaH2O that more rock will serve as a better filtration system. |