I am going to be moving my toads to a larger 40 gallon tank and I was curious what the ideal water depth should be? Everywhere I read says anywhere from 2" to 8" I have them in about 2.5" right now and I worry that it may be too deep but I honestly have no clue. The tank just has a considerable amount of more height then their 10 gallon and I want to use as much of it as possible. My idea is to have the land area to crescent around the water and gradually get deeper towards the front of the tank. Thanks guys.