+1. They say you can drink the water that touches it, but we also drink chlorine, cloramines, copper, alumn, silt, algae and bacteria. IMO, as long as it is not mold and mildew resistant, it should be ok.
Though, if you have a leak in a glass tank, I suggest using silicone and if you have a leak in an acrylic tank, I recommend using weld on #16.