We have a nice little pond in our garden with a cute little waterfall and fountain in it, how do we keep all the micro habitat from overgrowing? Simple, just complete the food chain --- Pond = natural attraction for frogs, frogs eat algae and mosquito larvae and all the rest of it, lay eggs, leave, leaving it only a bit messy for a bit, with algae only. Come summer they come back and croak all night long in the warmth and then restart the cycle. Unfortunately i dont recommend putting a frog in your water butt, unless you would like extra "protein" coming out from the tap