Today I recieved my Gen-X PCX55, and a Mag 3.5 (for general utility use) I also recieved 100lbs of my 150lbs Base Rock order.
I've done quite a bit of research about what substrate to use or what not to use. I think this stuff is great, I like the black look and I have no worries about the buffering abilities (or not) of aragonite. Bare bottom tanks don't even have sand, I'll be running a Kalk reactor and possibly a Calcium Reactor to take care of my pH, so I think I'm good. I hope to keep the sand looking black with a lot of sandbed creatures and general maintenance. No different than keeping white sand white really...