Might try and actually read the information printed on the tube, or go to the manufacturer's website. There are a lot of similar products, with very different properties. I did some shopping for silicone-goo, for the purpose of making molds for pewter/lead alloy, around 460 degrees F. Unfortunately, I had no luck figuring out what the magic solvent was, that could thin it down for pooring. Remembered be told as a kid, and it was common...
Anyway, back to the post. It's simple to get the right information, much better then coming home to an empty tank, which I'd guess to be much worse then a few dead fish...