I am going to purchase a 90 gal tank with built in overflow and stand. now i understand that a Fluval 404 is the recommend filter for this tank size? i want to use a sump as a filtration system do i need both? and is there a STORE bought sump i can get? i am horrible at build your own tank stuff. i am becoming overwhelmed with the filtration choices i understand what is available but what is best? if my Octopus dies i dont want it to be from some silly mistake i made in set up. with my SW fish i used an under gravel filter with dual power heads and an outboard filter rated for twice tank size i never used sumps or protien skimmers any advise from the gallery?