| Probably wasn't made to be resistant to the moisture put off by an aquarium, or to deal with the tiny splashes made by the filter.
Chances are that if you've got it on glass, and if you protect it from splash from the filter, it should be okay. I'm not positive, though. "If all else fails, follow instructions. Failing to do so makes you solely responsible for whatever happens, good or bad." (advice given to me by a ceramics teacher. He was talking about clays, slips, glazes, and firing, but it applies to many things in life) |