Power Filters....!
Hi Caz,
I have some advice on this subject. I have used a H.O.T. Magnum (Hang On Tank) canister filter. It filters 250 GPH and is actually two filters in one, you can polish you're water with the micron cartridge, or just filter the water in your tank. They make two accessory kits for it: 1) MARINELAND'S POWER KLEEN KIT which allows you to use your canister filter as a vacuum cleaner for your tank, and 2) THE BIO WHEEL PRO 60 which allows you to connect directly two bio wheels to your existing filter, thus gving you mechanical, chemical and biological filtration all in one handy kit.
Check out the following website
www.DrsFosterSmith.com and you will be able to find this filter with the kits explained above, I can honestly tell you The only other filter I would even consider using versus my HOT Magnum is the Marineland EMPEROR 400.
I've had mine now for seven years, and the only parts I've changed is the D shaped oring on the main cover, and the impeller motor which had to be replaced after five years. I had Oscars about five years ago, and this filter was more than enough to keep my Oscars healthy. Word of Caution you will need at a minimum a 70 Gallon tank for Oscars.
Very Sincerely,
Tiburon72