Can you help me with this I got home and found a acro rtn bad.I changed the rowa a few days ago but does 5ml xtra of alk to avoid the dip I tested the next day alk was fine at 8 which I usualy have it. It was a newer mariculture acro I didnt have bone snips to frag so I tossed it this is my first coral loss besides a few zoas that got eaten i think.IT has been 3 days since the rowa was changed,found rtn today..What am I doing wrong is there a specific way to change rowa in reactor, I wait till I see algae on glass then change .its the second time I change it since tank is up..Should I stick to a monthly change schedule and mabe use less media so the change wont affect the drop in phos too fast..If any body can suggest anything I really need to learn from this loss and what I did wrong I havent had any problems except some corals grow and color better than others.I search and read lots of articals but most are too scientific,understandable but dont give insight on how to manage the issues.Also how long does everyone let the water change water sit before using..I gonna invest in a digital ph meter mabe I am doing something wrong when I swap water..Thankz SteveZ