Had some unnoticed seepage, could have been a drip (splash) off a tank top, or some kind of wicking action, not sure.
Leaned on the stand the other day, heard a creak, and the 55 gal tank dropped 2" on one side.
After draining the tank, turned the stand on end and found this.
Been set up a couple years, could have been that long, its in a line with 7 other tanks, and on a sump, and crammed into a small space.
When I first set it up below
its the one on the left below
Fixed the stand a couple days ago with a 2 X 4, filled tank today, redid some of the plumbing, and going to let it sit overnight before adding anything else.