Am I a dunce? I wanted a maxijet, but when I got to King Ed's they didn't have any of the smaller ones and I didn't want a 1200, so I got the AC70. Anyway, they convinced me to get the filter attachment to prevent little fishes from getting sucked in (mostly my Cories). I'm forever cleaning that thing, which is a bit annoying, but the most annoying thing is that the venturi feature doesn't appear to work properly. It works only for a day after I clean it out. Does it only work under extremely high flow rates? Should I remove the filter attachment? Should I sell it and get another maxijet?