I have two penguin power filters that came with my my aquarium but I decided not to use the UGF. A friend of mine suggested using them as mini filters/circulators but I'm not quite sure how to do that. I know I would get some sponge and put it on the intake of the powerhead but how would I mount them? They are designed to just sit on the uplift tubes and I just can't picture where they might 'reside' in the tank...