The downer with fish tanks for cages is, that they let the heat and humidity out right through the screen tops. However, my way around it was to use hotter heat lamps, under the tank heaters, mist more often, and cover the screen lids of the tanks with damp towels. For me it kept everything perfect, now you have a 175 gallon so it may be harder for you than me, I only have a 125 gallon. I just don't see why people don't understand, if I could make it work for me, and keep the heat and humidity good, why is it an issue? Are there other down falls that I am unaware of? The tanks are big enough for small ones, so if size/heat/humidity is not the true issue, then what is?