Well I know I already posted on this thread however I cant tell you what kind of brand to buy lol. I have 5 filters and they're all diff makers except the two emp 400's are the same. I have a fluval U4, a eheim classic 2217, a walmart brand filter and 2 emp's. If you like the way fluvals are set up get one instead of the eheim, or go for the eheim and if you like it awesome if not take it back? and get the 405?