I know myself, so I expect the worst. For a relatively bright man, I do STUPID things sometimes. Like 10 minutes ago. I was filling the built loop for the 1st time. My fill options didn't work out as planned, so I filled the bay res first, and then filled the tube res.NOOB MISTAKE:
I left the drain port open on the bay res WHILE I was filling the tube res.
Not understanding how water and gravity work, it became apparent that water can push air and water out of a bay res in a hurry. Therefore every hard drive in my system just got a bath. 2 SSDs and 4 1TB drives got a bit wet. Oh well, they probably needed cleaning anyway!
Leak testing is happening now!