I have a job on campus taking care of the fish lab, and I just got permission to buy new filters for all the tanks. The current power filters are old and losing power. What is your favorite fresh water filter? My supervisor generally uses thatpetplace.com for his supplies, but if i can find stuff cheaper elsewhere im sure that will score me some bonus points. Right now we just have the good ol' whisper filters. I don't like using the filters that require you to buy special inserts every time to change the media. (unless you are aware of higher performance by them) right now I just refill the charcoal bags, put new "poly fill" and they are good to go. We have two 100gal(ish?) tanks, a 55, and a bunch of 10's and 20's. (on a side note, anyone know what kind of fish on the left is? It came in with the shipment of convicts and no one here knows what he is.. ) Thanks!