I have some slate that's been stored outside for quite some time. I spent some time drilling and hammering it into some interesting shapes to put in a tank. After I was done, I did my best to remove the slime/moss/etc. that had built up on the slate over decades of being outside. It's been drying indoors for about a month. Once I put this in the tank, will the salt kill any nasty stuff on it, or do I have to do this? If I have to disinfect it (and I hope I don't) I thought of two methods: 1. Bake in oven at 400 F: The easiest, but also the most likely to crack the slate. 2. Soak in bleach soln., then soak in soln. with bleach neutralizing agent: Sort of a pain, and will probably take weeks. Any ideas?