Very nice!!! Congrats on making it the first year, it is by far the hardest. It looks like you have a great setup and doing what it takes to keep up on parameters. I am right there myself.. I just installed a dripper for kalk in addition to my ATO, but I can't keep up with calc or alk so I am going to switch over like you did, full kalk top off along with dosing 2 part... time to look for a ca reactor it seems. 