I've used it on all my tanks, and my shallow 60 as of three days ago. I like it, easy to cement together (hydraulic cement, e-marco etc), and you don't really have to do much more than rinse and dip it in RO for an hour or so to get most of the dust out/off. I haven't noticed PO4 spiking months later, there really isn't much of any dead organic material to break down (unlike pukani) as it's a quarried material.
If you want to break the pieces down a hammer and chisel will be pretty easy, and it usually breaks off with a lot of character left in the rock, rather than just a sliced section. You can also cut it with a wet tile saw to get a flat, stable bottom for the glass if that matters.
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