Quick update on my CaRX situation. I think I mentioned on here before about my CaRX being maxxed out and not keeping up with my usage in my tank once everything was happy again. Well, come to find out, the real problem was my pH probe (off by 0.35!)... either I didn't calibrate it correctly last time (1 month ago) or the probe is going bad. Either way, I switched the tank probe for the CaRX probe and recalibrated both just to be sure. My effluent is coming out a lot higher now and I'm not having to hand-dose to keep up with my usage!
As a backup, I have a giant CaRX on loan and if I can get it up and running, I may just do the swap and be upgrade proof for when my wife royally screws something up and I can guilt her into a 400+gal tank. Not likely since I'm running the higher score on screwups but a guy can dream!