Thanx cloak for your answer.
My tank is 180 gallons, 7 months old. Readings are all zero. Me-hi lamps. Lots of fish in the tank. I have thriving eufilias but some other corals are failing. This particular coral has been in the tank for 2 months now.
It has changed color , now it has these fluorescent green lines over it.
I don't know if it is alive or dead. I saw this cyst today - I keep constant watch over the tank.
I'm worried about it bursting and releasing all sorts of toxic chemicals to the tank.
That why I really need some help!