Hi,
First, I would like to show you this good looking Acan, I got a while back

Look at those purple and green colors, I think it's so beautiful!
But look at it now

It's like, brown? Have no real colors, not really any purple or green left, just boring. The same story about the red to the right. In the start, it was bright red with blue around it. Now it's a boring red, with white/gray around it.
What can be the reason for that?
I've had some issues with high nitrate recently, but the corals lost its colors way before that.
My last measurements is Nitrate 10, Calcium 460, Alkalinity 11,7 and Mg 1275.
I'm not dosing anything, but I'm doing 10% water change every 1 or 2 weeks, and that's enough to keep it stable. I have used Red Sea Pro Salt so far, but have changed to the normal Red Sea, for lower values.
I have 2 Kessil a360WE over my tank, and my theory is, that it's something about the light, theres the reason for this?!
Please correct me if I'm wrong, but if they had got to much light, they would be more white then brown?
Untill this week, my lightning schedule was:
11:30 they turn on
13:10 58% (from today, before 56%)
19:10 58%
22:00 turn off
Thats 6 hours peak time, at 58%. The lights are 28cm(11inch) over the water line. Is that to much or not enough?
Stats about my aquarium:
My tank is 90cm(around 35inch)x60cm(around 23inch) and 45cm(around 18inch) high.
I hope I've got everything here, else feel free to ask
I have a anchor coral too, with the same issue. Boring, brownish colors. Not the vibrant green and purple as when I get it.
Hope you guy's can help me, to get my good looking corals back
First, I would like to show you this good looking Acan, I got a while back

Look at those purple and green colors, I think it's so beautiful!
But look at it now

It's like, brown? Have no real colors, not really any purple or green left, just boring. The same story about the red to the right. In the start, it was bright red with blue around it. Now it's a boring red, with white/gray around it.
What can be the reason for that?
I've had some issues with high nitrate recently, but the corals lost its colors way before that.
My last measurements is Nitrate 10, Calcium 460, Alkalinity 11,7 and Mg 1275.
I'm not dosing anything, but I'm doing 10% water change every 1 or 2 weeks, and that's enough to keep it stable. I have used Red Sea Pro Salt so far, but have changed to the normal Red Sea, for lower values.
I have 2 Kessil a360WE over my tank, and my theory is, that it's something about the light, theres the reason for this?!
Please correct me if I'm wrong, but if they had got to much light, they would be more white then brown?
Untill this week, my lightning schedule was:
11:30 they turn on
13:10 58% (from today, before 56%)
19:10 58%
22:00 turn off
Thats 6 hours peak time, at 58%. The lights are 28cm(11inch) over the water line. Is that to much or not enough?
Stats about my aquarium:
My tank is 90cm(around 35inch)x60cm(around 23inch) and 45cm(around 18inch) high.
I hope I've got everything here, else feel free to ask

I have a anchor coral too, with the same issue. Boring, brownish colors. Not the vibrant green and purple as when I get it.
Hope you guy's can help me, to get my good looking corals back
