coral bleaching

I have an rsm 130 with a lot of various lps and 1 or 2 sps. It has been running for close to a year now and all of a sudden everything is bleaching...from the pc's...wth? I have had many tanks in my life with led's and pc's and have never had a problem with coral bleaching from pc's. Has anybody else? These ones are only 36w bulbs. Very frustrated. I have just been leaving my blue stunners on to try and save them any help?? Thanks in advance.

bstuver wrote: Did you just change bulbs and they started bleaching? How's your alk? I know when I had a few things bleach my alk had gotten out of whack!

Good call Jackie I was thinking the same thing what is your Alk at ?

Have you added anything that would strip phosphates and nitrates? My friend added bio pellets and it caused his corals to bleach.

If Phosphate and nitrate are truly at zero, which is debatable depending on what kit was used and the error margin of even the best kits, your Coral's could be starving. What are you using to control Nitrate and phosphate?   Too much GFO will definitely bleach coral.

Did you introduce any new corals lately?

Maybe it is not just a bleaching episode, maybe some kind of disease/ infection brought in?

No the corals I have in there have been in for a year. 3 fish are healthy. Same size bottle of prime used also (small)

If your bulbs are a year old I'd replace them. Like I said earlier it could be nutrients are too low and you need to feed some more or add some fish. A good way to tell if nutrients are too low is how often you need to clean the front glass of the aquarium. Do you have any film algae growth on the glass or any algae at all in the tank?

did you check your temperature?