Could i hook up two 30g trash cans behind the waterfall? Could that be the bog filtration or how does that work. Is that too small for a pond lightly stocked.. i vision a pond with a waterfall with plants all around it.. filtration hidden behind the waterfall and i would half dig them into the ground so they are not so tall and blocking my fence and other palm trees. And what is difference from a bog and a tote and.are there other.options? How do i make the waterfall into filter