I just learned a hard lesson or two... and my babies suffered during it because of my stupid ego.
It goes like this:
During a water-change few weeks back, I decided it was time to singularly unitize my 40-gal's filtration into one large container. With it on-hand (API XP4), I eliminated the the two smaller ones setup in-series (XP2->XP3) and also rang-out the sponge media on the inlet tube. With part of the sponge media gone from within the previous canister setup, I thought everything would be fine... Or so I thought.