TWO UPDATES: (Was Wrong. OLD "Mag" kit Bad. New Kit Good) and (Got used Frag Tank)
So I got a Aquaforest MAG test Kit. I usually don't like to change test kits, but AF Mag kit is Exactly the Salifert. Even the solutions, amounts, and tables.
But it comes with a Reference Solution, so I tested it with Salifert kit.
The Fresh New Kit is good. Thus the Old Salifert Kit tests were wrong.
LESSSON LEARNED: Don't use test kits down to the Last Drop.
This mean my MAG is just under 1500. In MAG higher isn't dangerous. Lower is. (That is what I understand)
And I found a used Tank on kijii. Bit scratched, but no leaks. Perfect size and glass.
I compared Frag tanks made of acrylic. For what I saved going used, I have something to work with. I was thinking 8" high, but now that I have it on table, 12" depth is ideal.
I have the OverFlow, so won't need glass drilling to start.
And what I didn't realize till I brought it home, is I have
two Glass Plates from a Terrarium that I ripped apart (but kept each glass Pane, with Moldings).
They fit perfectly as Lids, to reduce evaporation, etc, and the little gap will ventilate enough to reduce condensation for better viewing.