A few more really newbie questions. I plan to use the gravel for drainage and will form out a small pond out of that. In this type of drainage setup in a 10g tank, are you supposed to change the water? If so how often? Am I missing any inportant details about this? I plan to get the tank up and running a while before i introduce any frogs. What type of plants can you guys recommend for a tank this size? Thanks very much.