I just bought a Cascade 1000 canister filter used from some people I've "done business" with before (they gave me my 29gal and sold me two heaters and a 48" fixture for my 55gal) for $20.*BOUNCINGS The filter is in like-new condition and is in working order. They took the top off to clean it (I was told) and to fix the impeller since it was apparently loose from the filter being tossed around while they moved a while back. ANYWAY, now I can't get two of the release clips to release! 
The two on the sides release with no problem, but the ones on the front and back will only move up, they won't fully release. The filter didn't come with the instruction sheet (even though it did come in th original box!), but I emailed Penn-Plax and they sent me a PDF copy of the instruction sheet. I'm staring at the instruction sheet right now and it is not making ANY sense at all to me. HELP please!!! I really need to get this filter installed on the 55gal so I can start working on the 29gal.
The two on the sides release with no problem, but the ones on the front and back will only move up, they won't fully release. The filter didn't come with the instruction sheet (even though it did come in th original box!), but I emailed Penn-Plax and they sent me a PDF copy of the instruction sheet. I'm staring at the instruction sheet right now and it is not making ANY sense at all to me. HELP please!!! I really need to get this filter installed on the 55gal so I can start working on the 29gal.