hey guys and gals, I want to set up my 40 gal tall to be a brackish archer fish setup, I want to fill it only 2/3 of the way full.. what do you think would be the best internal filter to use for this setup? I've been looking at the fluval plus 4 and the eheim 2212 aquaball... let me know which you think is better or which you've been the most successful with, thanks!