I have a 28g reef tank. I have a three yellow-tailed damsels, two clowns, a frog spawn, a hammer coral, a sun coral, and a frag of xenias.
Yesterday I did a 5 gallon water change. Almost instantly the corals closed. The frog and hammer came back out after a few hours, but the xenia has shrunk to very small, but is keeping it's color.
Here is the xenia yesterday before the water change...
Are they dead? The frog and hammer seem back to normal, BUT...
My damsel fish are hiding. They aren't even eating.
I did a water test, and everything looks good....
Ammonia, nitrites, nitrates all 0
I know the dkh
Suggestions? Help! What is going on? I don't want to loose my system....