I've been acquiring quite a few sps frags recently, and I've built a small little frag rack in the corner of my 55 gallon.
I've gotten various species of monti digitata and capricornis, as well as a couple acro millepora. Most of which are doing well. I do have a blue tipped digi that I somewhat destroyed when I first got it. I wasn't dosing Ca or keeping up with water changes and I had it right next to a modded maxi jet. I basically blew the flesh off of it. It has recovered a bit, but is battling algae on the dead part of the frag.
I recently picked up what was coined a tri-color acro at a local frag swap. It's purple with green polyps. I've yet to see a third color, but I haven't seen much polyp extension since adding it to the tank.
I added a powerhead closer to the frag rack to ensure that there is ample flow in that area of the tank.
Since I'm not too sure what normal polyp extension should look like for this species, I'm not sure how well it's acclimating. It's been in the tank less that a week.
I'm dosing ESV B-Ionic to maintain Ca and Alk. I'm using IO salt, which I've discovered has low Mg. I'm considering a slow change over, but I'm not sure which brand I'll switch to yet. The B-Ionic does contain Mg, so hopefully that is supplementing a bit. Mg is the one test kit I don't own, so I won't be able to provide test results for that element.
I just wanted to get some initial thoughts on this.
I'll post pics and params tonight.