Ha. there's a frog joke in there somewhere...but yes you are absolutely correct.
Last night I completely missed the movie we were watching because although I appeared to be watching, my mind was 100% on vivarium possibilites, lol.
I have a waterfall in my tiny (less than 50G) outdoor pond for my Red Eared Slider, but it's a lot easier when you have the whole backyard and aren't working inside a glass box.