home depots clear silicone works fine , the difference is silicone 1 has no mildew preventer in it the newer silicone 2 has addatives in it so just make sure u buy silicone 1 and u r good to go , its says silicone 1 right on the tube , a tube for a caulk gun , not no hand squeezer , I have used it several times and had no ill effects .
+2 on the GE silicone. It says on it 100% silicone. White tube with a red label. At the HD in New Milford, it is in the back with the glass and plastic sheets. For some reason they don't always have it with the other silicone. Its also much cheaper than the "aquarium safe" stuff.