fish at the top, corals closed, whats up?

[neoh]

nitrate: 10
nitrite: 0.1
amonia: 0
ph: 8.2
temp: 28.5C
sal: 1.024

All my mushrooms closed, and my fish are at the top of the tank.

Did a 20% water change and everything went back to normal, for about an hour, then it's the same thing.

Any ideas would be much appreciated.