ok thanks guys, i used shims, the 400 gal is on the rack!
* after 4 days of scratch removal nightmare, whew.
just a note, for this used acrylic tank, novus 3 worked following 3000 grit. i used straight muratic acid, then with a electric sander: 800 grit on bad spots...
and at the sand line down 1000, 1500, 2000, and this janky 3000 grit pad from autozone, which to my surprise, worked insanely well. then novus 3 and 2, whole tank, applied with microfibre attached to the electric sander (that squarish one). everything employed the electric sander, woulda died more without it.
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