@Gordon Nichols - Haha. trash bin comments noted. I do have that napa filter just below the tank, so thanks for linking that... that gives me some reassurance I've done a couple of things right.
For the placement of the rotary pump, how do you access that space easily? Changing the filter was a bit of a **** show as it was hard to get my hands in there. I'm wondering if there's a secret "insiders" trick here.
Thanks for taking the time to help!