Hey, I just got into keeping a 20g reef tank which is awesome. I love keeping animals that you dont ever get to see everyday. I just got a thought while I was at the fish store. I was wondering if it would be possible to keep a self sustaining system? Would I be able to keep a few poison dart frogs, with a small waterfall into a small pond? Would it be possible to keep plants and insects in the terrarium without me having to do anything? My goal is to get a system running and just watch what it does with nothing interfering it. Has anyone done this or attempted to?