110 gallon vivarium build

[Timbo]

so here is one of my sections of "rock" I just finished mortaring I mixed the mortar mixture with an acrylic fortifier because i herd that if you do that is shouldn't leach junk into your water. I am planing on do some painting on them to make them look more like rocks, with acrylic paint of course. I have been seeing people coating there stuff in silicon in this case is that needed??