Those are great questions. Dart frogs do not require pools to soak in. They do require periodic misting to mimic the rains of the rainforest. Twice a week for about 20 seconds is adequate. To discourage breeding, ensure that you do not have any pools of standing water. If they do not have anywhere to deposit tads, they will lay eggs and the eggs will just dry up. A sure fire way is to keep only one but that's obvious. Most darts increase breeding behavior with the increase of rain which increases pools of standing water which increases food sources in the wild and provides tad deposition sites. Keep humidity on the low end by misting every 4-5 days (about 80% humidity is good ), feed every 2-3 days which limits over feeding, and allow leaf litter to dry slightly. These conditions are fine for the frogs but will not be conducive to breeding.

If you ever change your mind, do the opposite of what I've said. Water daily, feed daily, and add film canisters attached to the sides at about 30-45 degree angles about 1-3 inches of height. Variety is key. You'll have tads in no time.

Hope this helps and best of luck.