apart from breeding season, i dont even give them water, we use paper towl in the bottom of their tank, and saturate the tank with a mister twice to three times daily, the paper towl in usually a mm or two underwater, that way, the frogs drink the droplets of water througout the tank, and the crix don't drown. the paper is changed and tank cleaned twice a week. we use a plastic broad leafed aquarium plant in the enclosures so the frogs have platforms to chill on, and the beads of water of sit in the folage. this keeps the humidity up, frogs moist and everyones happy.