100% silicone is safe after it has cured for at least 18 hours preferably 24. I use GE Silicone I (100% Silicone Rubber). If Silicone II is 100% Silicone then it should be alright. The color is not a factor. What you have to watch out for is Silicone that has a mold / mildew resistant formula. Usually it's the one that says "Tub & Tile" or Bathroom and Kitchen. That Mold & Mildew resistant kind has chemicals in it that will kill your frogs eventually, even after it's cured. I just checked the last tube I used and it says "windows and doors" on it.
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