I was just about to say that. lol ATLEAST 2 emperor 400s lol... If you get a canister they are a bit better you could prolly get one canister rated for a 100 gall
With 2 oscars in a 75g tank, you want at least 2 canister filters rated by the manufacturer for 150g and up. One canister to handle each oscar's waste. I would also put an ac110 or two to handle the mechanical filtration. Fill it with pillow stuffing or polyfilter fiber, and discard the stuffing once it gets too clogged up.
i got a oscar and green terror in a 75 with a canister rated for about 200 and its doing great. its one of those aquatop offbrand, and its under 90 buck so a good deal
i got a oscar and green terror in a 75 with a canister rated for about 200 and its doing great. its one of those aquatop offbrand, and its under 90 buck so a good deal