Coral Bleching

[isaac]

Hi guys.
I have 125 gal reef tank.
I found this mornig that about 60% of my corals are bleching.
all the testing are fine!!!
Water temp between 78 to 80.
My calcium 400.
What is going on?
PLEASE HELP

 

[bigblue69]

Waht kind of lighting do you have? and did you light acclimate them?

 

[bigblue69]

Also how much flow do you have?

 

[isaac]

I have 2 400w 15k 2 VHO and I have 2 pumbs that runing my tank, I have the corals for about 8 months and they did good and growing.
Till,,,,,,

 

[fish addict]

I am assuming when you say 400W you mean 400W of MH so maybe it is just time for a bulb change?

 

[isaac]

my MH are 3 months old