SPS become white

[Sam Devos]

Hello everyone,

Sorry if my english is not so good. I am from belgium.

I have a red sea reefer 450, the tank is almost 9 months old. I am running on DSR method.

All my corals are doing well. The watervalues are already months very stabile. 3 months ago i bought 5 acropora's and a hystrix coral.
The last 2 weeks my acro's and hystrix becomes white. Already 1 i removed from the tank. My water values aren't changed. What could be the reason of that?

Salinity = 1025
Ph = 8,3
kh = 8,1
nh3 = 0
no2 = 0
no3 = 2,5
po4 = 0,02
CA = 425
mg = 1350

 

[P-Dub]

Hello everyone,

Sorry if my english is not so good. I am from belgium.

I have a red sea reefer 450, the tank is almost 9 months old. I am running on DSR method.

All my corals are doing well. The watervalues are already months very stabile. 3 months ago i bought 5 acropora's and a hystrix coral.
The last 2 weeks my acro's and hystrix becomes white. Already 1 i removed from the tank. My water values aren't changed. What could be the reason of that?

Salinity = 1025
Ph = 8,3
kh = 8,1
nh3 = 0
no2 = 0
no3 = 2,5
po4 = 0,02
CA = 425
mg = 1350

Hey Sam. Some photos of the individual corals, a whole tank shot, and info about the lighting you use, the light schedule, and height of the fixture(s) would certainly help in figuring out what is going on...

 

[pdxmonkeyboy]

If they are just turning white, it is almost certainly too much light.

If the tissue is receding from the base, that is another whole different ball of wax

 

[Sam Devos]

Thank for the answers. i will post some pics.

Today i see i have also a montipora that also comes white..
in the pictures you see my aquaroum, and also an acropora that comes white.
In the last picture you see my weekly watervalues.

what settings are best of lighting. would the white of the acropora be the reason of something wrong in the water or a problem with the light?

My aquarium is 150cm long 50 cm deep and 60 cm heigh. i have here 2 philips coral care with the intensity set at 60 percent.

 

[pdxmonkeyboy]

Doesn't look too bad. Your nitrate and phos numbers are a little low but nothing to really worry about. At least your alk isn't in the high range. high alk and light combined with low nutrients is a good recipe for bleaching. I would suggest maybe just backing off the lights a little.

I don't really know much about LED so can't help you there. My light settings are ON and OFF.

 

[LC8Sumi]

Time for an icp test

 

[P-Dub]

I am not familiar with that particular light and we didn't get the intensity of the light you have and what that light schedule is. If you could let us know what is your light schedule, the intensities as the light schedule progresses through the day, and the height of the fixture over the water and, finally, the depth the corals are placed relative to the water surface. Considering your relatively good parameters (would be great to know what test kits you are using) and that the corals have been there for 5 months, I certainly would expect at least some encrusting at the base and I see none. I am leaning toward the intensity being too high for the corals. If you could also take a shot of each stony coral, even the ones seemingly not affected, we could get a handle on this. Barring all that, I suspect your intensity is too high for those particular corals so intensity adjustments or placement adjustments are possibly the answer. That, or your tests are off and an ICP would reveal this.