Originally Posted by Windblowswolf
I think What I'll do Is boil a big pot of water and take it off the eye then dump in (slowly) the gravel and rocks as well as the cave thing so that the mold is boiled off.
Mix in salt with the boiling water then let it cool to about 175°. Don't pour water in the tank, give it some sunlight.
Small tanks are not safety glass, they will shatter and go for your toes.
I've heard that rinsing the tank with 50/50 isopropyl using a glove and sponge kills most the stuff like that. I know it knocks mildew right out of my work collars. Careful tho, its alcohol with the risks that come with it. No smokey, etc. Isopropyl is cheap too.
Just have no idea what type of epoxy/resin they used to make those fake sandstone things.