Radion LEDs causing corals to fade/bleach...help!!

[rampro6698]

You may have flow issues. If your tank is 12 foot long and all your pumps are on the ends you could have dead spots. You run 25-30x's turnover in your tank. I run 50-60x's and actually think I could use more. SPS need lots of flow. The stuff you see could be detritus settling out. Without seeing it in person I do not know for sure.

Regarding tank flow issues: do you know of a way to put a powerhead close to the bottom without stirring up or distorting the sand bed too much? I have tried moving my current powerheads lower in various places and inevitably this large bottom out area occurs over several days where the water flow jet moves the sand too much. Can I direct it a the glass and maybe see if the flow is enough to keep stuff in the water column but not stir up the sand? I am using a regular aragonite bed (not fine sand) but then a fine sand second layer bed underneath. It never touches the fine sand bed (it remains undisturbed).

 

[s2nhle]

With my radion pros, I have my blue and royal blue peak at 100%. White are around 50%. The light intensity is at peak time 70%. I will give the exact configuration when I am able to login to the ecotech site. It is down right now.

 

[rampro6698]

With my radion pros, I have my blue and royal blue peak at 100%. White are around 50%. The light intensity is at peak time 70%. I will give the exact configuration when I am able to login to the ecotech site. It is down right now.

My settings are similar, except my peak intensity is at 25%. I don't have any red spectrum in the lighting template right now, green about 15-20%. I really think my coral fading issue is related to other stuff as people have pointed out and not the lights. I think maybe the lights could have been a start of it when the tank was first setup, but now I think it is other stuff. Because it's lack of coral growth overall too, not just fading. So I don't think there is enough nutrients, etc. I still can't t explain the brown covering the gravel bed (diatoms vs detritus?-but that would mean nutrients are in excess). I don't know....

 

[Wazzel]

25% is not much light. If you have other things below that and channels turned off you could be well below 25% of the fixture power. I ran a hydra 52 over my 60 cube at around 96% of the fixture output. In June I added a second and currently have blue, blue and violet at 80% and the rest at 72%. They are on a long acclimation to get to 100% on the B,B and V channels and 90% on the rest.

I think lack of light is part of your issue. You could have a few different things going on.