I just got home from work to find most of my corals looking deflated and sickly. All zoas are closed up (I've never had any zoa's that will stay open more than partially), my frogspawn is more closed than normal - no brown jelly. Bubble corals not looking as vibrant as normal.
I've got a 75 gallon tank with a 20 gallon long sump.
Water test results:
ammonia, nitrite, nitrate: 0
phosphates: reading 0
The only thing I can think of is I took my skimmer out of the sump yesterday so I could clean it because it wasn't making bubbles as vigorously as normal and had lots of coralline growth in it.
My lights are a 4x54T5 fixture with less than 6 month old ATI bulbs (2 blue plus, 1 purple plus, 1 white).
My 3 fish (lol) are doing fine! 6 line wrasse, yellow watchman goby, and one percula clown. (there's more in qt
If you can think of something I haven't, please let me know!