Well, as a local LFS started carrying RPM I’m making the jump from IO. Nothing wrong with IO, but I started with RPM a few years ago then switched to IO when I ran out and was in a bind with a shipping snafu. Never switched back until today. That was a whole different tank and this one has been IO from day one, but RPM is closer to my parameters. So.... I just finished deep cleaning my brown stained IO 50 gallon brute and will be doing a 10 gallon change Sunday. Hopefully all goes well. I’ll probably add my new salt into the mixing station tonight as it circulates 24/7. I will report back.