Actually it was the compression fitting at the top that leaked. I never really expected to use it, so no big loss. Merely practicing my DIY skills and adding to the TPT list of 1000 ways NOT to make a canister filter. We've gotta be getting close...
I'm actually headed back out the the garage to try again with a 4.75" diameter x 9" piece of acrylic tube I've been dying to mess with for months. I don't expect that one to work either so I just bought a Hydor Prime 10 on Amazon.