Thanks for the info buddy

I'll try in the next few months to have a pic together,in front of your tank!:beachbum:
Look forward to it.

Now if Biggles, Bello and a few others could join that would be a blast!
I hope you are beautiful because i'm really ugly:lolspin:
:lmao:
Kevin is better looking than me. :lol:
Top downs are insane!:hmm3:
And you are not happy with the colors?
There are a a few SPS which are still brown and a few that are halfway colourful because of me not taking care of the Alk level...for example, my Hot Pink Millepora is no longer as nice. The Red/Rose Millepora now looks better.
nice colors in your tank.
Thanks.
The top downs look awesome I don't see what your talking about on the colors..
See above regarding the brown ones...I guess I really need to keep an eye on the parameters much better than I have been.
Question = how high above the surface are you running your fixture? My powermodule just seems to bleach my corals thinking of switching it out to 20k radiums soon..
I am running my fixture 7.5inches above water line. My corals get around 400PAR even on the bottom of the tank.
Raise your fixture to at least 10-12inches AWL and see if it makes a difference.
Note this...T5 tube lengths and watts and watts/inch:
24watt T5 = 24" ACTUAL tube length = 22" So, 24/22 = 1.09watts per inch;
39watt T5 = 36" ACTUAL tube length = 34" So, 39/34 = 1.15watts per inch;
54watt T5 = 48" ACTUAL tube length = 45.8" So, 54/45.8 = 1.18watts per inch;
80watt T5 = 60" ACTUAL tube length = 57.6" So, 80/57.6 = 1.38watts per inch
The longer the T5 tube, the more watts is actually running through it and therefore it would be producing a little bit more PAR per unit area compared to a shorter length.
So I would definitely raise the fixture up a bit more than you have now, and see what happens over a few weeks. Corals should become less bleached. #
Also, if you have quick access to a PAR meter, use that to raise the ATI unit to a height where most of your SPS are getting around 300PAR. IF you dont get any improvement after that, then it perhaps isnt your lights...maybe you are stripping your water too much. Because most of your SPS must be able to handle at least 300PAR easily (exceptions are stuff like Lokani and other "deepwater" types).
Also, dont run all 8 tubes for no more than 6 hours.