ok i did it. i have 4 oscars in the tank now, and i have a combined total of about 1100gph in filtration. one canister, 2 bio and 2 powerhead w/ spounge filter plkugged reverse flow into a ugf. I got 2 tiger, 1 red, and 1 albino....so far they seem to be doing great together. although the 5 guppys i put in the tank didnt last more then about 1 minute...haha :- D. what really amuses me is the goldfish that is about 2 inches long, that is almost like the leader of the pack....instead of acting all goldfish spazzy, he swims all hardcore now like an oscar haha....and on the bottom of the tank...and where he goes, they go in a tight formation its so funny. Thanks for all your input guys. I appreciate. Any useful tips for the oscar raising?