I like the way you've basically built a wall support of blocks there. Reminds me of a basement in school. How many blocks is that? Are they glued or stacked?
Thanks. It's a rectangular block enclosure w/ an opening on the far side such that I can get underneath although being under the tank occasionally reminds me that I have made wiser choices in my time. There are roughly 90-100 blocks in that foundation and they are not glued. I wrestled w/ that quite a bit as I live in a seismic zone 4 region. The filled tank weighs several tons and tectonic plates weigh more so there is some risk. Hope is a poor strategy but it's the strategy I've got.