Hi Kathy, I started my 29 gal reef about 2 years ago and have only easy to keep corals like zoos, LPS, mushrooms,... since I have 196W PC. I'm doing 5 gal water change every week, so far everything was doing fine. Lately I noticed some zoos are shrinking, but other once multiply, even some mushrooms shrinks, some getting lighter, and they are in different areas. I got few new frags at the Swap and they doing just so, so. Maybe some pictures will help what I'm talking about. I will try to take some tomorrow.
Alkalinity test is in Milli equaivalents per liter.