Please Help. Corals Looking Bad.

[Jon Lazar]

In your case, the white areas are where the normally-colored tissue has died, and you're seeing the fresh coral skeleton.

 

If conditions improve in time and the corals stabilize, they will eventually resume growing.

[marinap]

^^ what John said. Make sure to measure alk at the same time daily. Keep an eye on calcuim levels as well, alk and calcium should be balanced.

[Origami]

Unfortunately, I can't see your pictures from the office, so I'm going to guess a little here.

 

I'm assuming that nothing huge changed while you were gone - no power losses, nobody cleaning the panes with Windex, etc. If you normally keep your calcium and alkalinity stable with manual dosing, one common suspect is low alk.

 

Re-test your alk with a test kit that you trust. The alk level that you posted is not at all bad, but if the reading is way off and your alk is really low, then things can turn in a hurry. Also, perform water changes even up to 50% if needed.