ya i think i'll just go for one koralia 3(850-gph) and put it so it collides with the flow from the maxi-jet

that'll work

Would you like to try and achive a gyre tank effect ? very cool.
check this out (scroll down to Gyre Tanks)
http://www.advancedaquarist.com/2007/1/aafeature

All you need is to get second flow source to pick up from the first in a loop sort of effect. this moves a lot of water !

thanx for the link andresont, i'll look inyo some of those ideas when i'm positioning powerheads and also for selection