2 power filters?
I'm gonna be honest here and say that....that tank needs way more filteration.
The most a power filter can pump is 440gph at least thats the most ive ever seen a power filter pump(aquaclear500).
W/ fish that big they will make a mess. Here is my rule for filteration for carnivorious or dirty fish.
10-12 times per hour is how many times you'll want your water turning over.
Which in your tank would be 3000-3600gph. So two power filters therefore wont do the job. I would say you'll need two really good wet/dry's and a couple fluval 404's. And two power heads to keep the water moving. I'm sure about now you are thinking OMG that is gonna cost a lot of [B]$[/B} well you're kinda right. That's 1/2 the reason i dont currently own a 300 gal tank. But I can try to make it cheaper:
order from big al's
http://www.bigalsonline.com/ Also did you ever think that changing 1/3 of the water that is 100 gal. of water!!!! You may want to do a 10% once a week instead.
You may want to invest in a python water changer which hooks up to the sink. and you can drain and fill straight through the sink. You can order this fairly cheaop from big al's.
------------------
Clint
CDevoe1111@aol.com