Zooanthellae??

Hi I have 3 corals, candy cane, gsp and moon favia.
They have all closed down for weeks now and the favia and candy are showing a little of their skeleton.
I had a bit of a "mistake" with my lights- I kept them in for over a year instead of changing them at 9 months.
I have replaced them yesterday.
I'm under the impression the corals might have lost their zooanthellae bacteita, can they get this back and will they be ok?

Advice on what to do welcome

 

If you replaced your bulbs all at once the are in light shock. You will need to cut your lighting period back to about 4 hours a day and add an hour a week until you get back to your normal light schedule.

What are all of your parameters they will have an impact also?

 

Ok I've cut light time back to 4 hrs, in your opinion will the corals be ok?
All my params are where they should be.

 

It is always hard to say but I think most likely. It will probably take several weeks until they recover.

What type of lighting do you have?

 

Two twin 55w t5's 10000k/actinic

 

Next time replace the bulbs one at a time every 3 or 4 days. You won't need to change your light period that way. I would switch the actinic to ATI Blue plus or Geisemann actinic +. That will add a substantial amount of PAR to the tank. Pure actinic bulbs have about 1/3 the PAR of other bulbs.

 

None have turned White they are all the same colour, they were like this before I changed the light bulbs. They are just closed down.
All my parameters are as they should be.