You say you used GE Silicone II Windows & Doors - I've been researching this too, as I'm about to redo a 70 gallon Oceanic tank. The Home Depot and Lowes websites both claim that GE Silicone II Windows & Doors has "mildew inhibitors" in it, but the GE Silicone I Windows & Doors does not. Would you be kind enough to share the sources that persuaded you to use the II instead of the I? I would really appreciate it!
I didn't see this until now sorry!
It is GE Silicone I sorry, I should edit that.