Yeah pretty sure, I spent about 1/2 an hour trying to get it to work, I thought at first it wasn't lining up, but definitely out of shape somewhere, I have never had an issue with it before, it normally seems to just go together. I know it sounds odd, thats why I asked here, I know a lot of people here use them.
Still confused as to what happened to the brown slimey stuff (bio-film) as well, does that mean the bacteria has died off?
I haven't noticed an ammonia spike but probably wouldn't with 2 filters running.