I have a terrarium/vivarium with water in the bottom for amphibians. I know from experience that some areas of my tank's glass tend to bead water and other areas sheet for reasons I don't know. The areas that sheet are much easier to see through. I would like a product that is a non-toxic, non-soluble, hydrophilic substance that can be applied to the inside of the glass. This would cause the water that inevitably condenses on the glass to sheet instead of beading. It might encourage algae growth, but algae can be removed from the glass easily with a scrubber or scraper. The areas of my tank that tend to sheet haven't had an algae problem anyway. I know that lots of people have amphibians as pets, so a lot of people need this product.

The question is, is there a substance that would work and would be safe and easy to use? Most hydrophilic substances tend to be water soluble and would quickly run off the glass. I suspect that the sheeting areas in my tank are due to slimy natural substances such as snail slime or algae, but I'm not sure. A slimy artificial substance might work if it is non-toxic and will stick well to the glass. Does anybody have a suggestion?

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