Update for those interested. Put two creamsicle and one black molly in the tank yesterday afternoon (Jan 6th, 11). We'll see how they do with Silicone II.
Bottom line is that although the GE Silicone II has NO mention of midewcides on the label, it DOES contain it, and without a toxicology report to back me up, has apparently killed fish in my tank. DO NOT USE GE SILICONE II IN YOUR FISH TANKS.