Too much light?

[haninja]

I have a 20g tall that I started 6 month ago as FOWLR and have recently decided to switch and have a nano reef.
I have upgraded the lights to a retro 2X65w with one 12K and one actinic.
I started noticing after a while (seems to be close to when I upgraded my lights) that my live rock has started bleaching. I’m running both lights for 6 hours a day. I can’t control the individual bulbs yet but I’m working on that. So, ideally, I could run the actinic one hour before and after the 12K.

Do I have too much light for my tank?

I have a bunch of LPS, some mushrooms and a flower anemone.

 

[barbra]

I don't think you have too much light, I suspect it is just the changes and improvements that you have made that are causing the difference. It should bounce back in a week or two.

 

[Icefire]

Not too much

 

[UnderCoverDork]

i have a 20 Tall

2 65w antinics ran 12 hrs a day
1 150 10K MH ran for 7 hrs a day

everything is wonderful and purple too

 

[haninja]

Thanks everybody. Now that I’ve ruled out my light as the cause of bleaching, I’ll have to see what else can cause it…

 

[drummereef]

The bleaching could come from the change in lighting. Also, look closely at your alkalinity, calcium, and magnesium supplimentation.

 

[barbra]

<a href=showthread.php?s=&postid=9740120#post9740120 target=_blank>Originally posted</a> by n0sferatu
Thanks everybody. Now that I’ve ruled out my light as the cause of bleaching, I’ll have to see what else can cause it…

I wouldn't rule out your lights at all. As I said, I think it is your lights. I don't think you have too much lighting, I think you're on the dim side. What I mean is that you have changed the light from what the tank had been accustomed to.