Purples bleaching

[Bouldereefer]

I have been having troubles with my purples bleaching to white. For example a blasto with purple rim and yellow center. The purple has bleached yet the yellow center is the same. Acanths with blue/purple bleach yet others with reds and oranges doing fine and growing. Favia purple out rim fading, center green fine. Any thoughts?
160 gal with sump and refuge.
Gen 2 Radions running SPS AB+ program
PAR: at the coral site 200-250
Salinity: 1.025
Salt: IO orange
pH: 8.1-8.2
Ca++: 410-450, calcium reactor
Nitrate: 4-5
Phosphate: < 0.001
Mg+: 1300
dKH: 9.5-10.5
no electric current by volt meter
Feed: mysis, copepods, reef roids, reef chili, all-for-reef
Thanks

 

[JustAnotherNanoTank]

It sounds like it could be a trace elements issue. Not fully sure though. Sounds odd.

 

[Bryknicks]

I would say that its either lack of nutrients (PO4) or trace elements. Do you perform regular water changes? What are your nutrient export methods?

 

[Bouldereefer]

Water changes are every two weeks. 20-25% each time. Not sure I understand nutrient export question. Water change, filter socks, protein skimmer and refuge. Was hoping all-for-reef from Tropic Marin would cover trace elements
It is odd as there is new growth on some of the corals, just no purple color (bleached out tissue)

 

[Bryknicks]

Post some pics when you can as I'm curious to see how they look. I would try to bring up the nutrients first to see if that helps. A couple options to do this are: adding more fish, feeding fish more, feeding corals more, cutting down on the fuge light time, cutting down on protein skimmer running time, cutting back on water changes to 10% bi-weekly.

With your current water changes and apparently using All for reef, then I doubt that trace elements are your issue at this point. If upping the nutrients don't work then it would be worthwhile to get an ICP test.

 

[Bouldereefer]

I have tried several times to get pictures. Even read the how to threads on R2R. I am just not able to get pictures to show what is happening

 

[reefl8r]

oh no

 

[milesbooher]

Must be trace elements

 

[MasterReef]

200-250 Par for Favia and Acans sounds high. That's almost double what I keep mine at. If you have the lights that intense for your SPS maybe you can try moving the LPS lower in the tank.