Thank ill took that uv pointer into consideration, however i always thought people kept them low. At least from the hydra forums , due to browning effect. But your theory does make sense.If I was troubleshooting this in my tank with your numbers OP I would say I would look at to low of nutrients and try bumping up your UV settings. I run my Hydra 52 at 35% UV and I have some friends that run it way higher. Think of it this way when you go out and suntan, your skin darkens and colors up to protect you against the suns UV. The same happens with color in corals. The color pigments help protect from UV damage. I found when I first got into LED I originally kept my UV lower around your levels and my color in my SPS was not as good as I had expected. I adjusted the UV higher at a maximum of 2% per week and they colored up. I made no other adjustments at this time only UV. Watch for any distress at this time closely and hold if you see any negative reactions for an extra week before continuing. If you go slow it will allow your corals to accumulate to the new levels and the color should increase. At 2% a week I have not noticed any issues with adjusting the light levels or UV higher. If you have experience with LED and are good at judging coral health you might be able to get away with 3% to 5% a week. If you do not stick to the safe 2% a week. This issue with UV is something unique to LED I find as you can't and don't need to mess with T5 or MH for UV.
I don't add any products for color in my tank and I always caution against adding products it unless it is absolutely needed. (Not saying they don't work just saying I choose not to put more cash in other people's pockets that I done have to.) So I would try upping your nutrients a little and adjust the UV first before making other changes or resorting to products. If this doesn't resolve your issue then look at other options. When troubleshooting tank issues and I am not 100% sure on the cause I like to rule out what is not causing the issue as it makes the pool of causes smaller and helps you focus on the more likely causes. Keep in mind making drastic changes to your tank can make your color issue worse so judge if it is worth it or not before taking any steps.
Also, i bumped up my doser to dose 7ml a day of acropower. On a good note i just noticed today , that my acros had nice p e something they never have during day. Could be that last night i dosed coralvits and reefbooster, or the new light schedule. Which is similar, just whites 5% less and only 8 hrs now.
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