ricordea bleaching

[saltank]

I've had a few ricordea for several months now and have noticed over time that they have lost most of their color and have pretty much stopped growing. I read that this can happen to shrooms under pc lighting due to some type of superoxide process, or something like that ( I have 206watt of pc over a 46 gal bowfront)

The funny thing is I have red shrooms in the same tank that are doing fine (growing and multiplying)

I have moved the ricordea down to the bottom of the tank in a low flow area. The have been there a couple weeks but I haven't noticed much improvement. Any suggestions? Should they be in higher flow, closer to the light, in the shade????

Thanks

Specs: 46gal bow
206watt pc (1 10,000k and 2 50/50 bulbs)
salinity 1.2 (slowly raising this)
calcium - 340
alk - 2.9
ph - 8.4
nitrate < 10
1-2" sand, 50lbs lr
aqua c remora skimmer

 

[Anonymous]

Closer to the light with more flow IMO.

 

[Anonymous]

Ricordea do better with brighter light, unlike other corallimorphians ("shrooms" is easier to spell - maybe I should have stuck with that).

I once read that pink and orange rics do better in even brighter positions, but my only pink ric wasted away no matter what I did, so I'm not sure about this.

FWIW, I have extremely healthy green rics at about 20" deep under 2 x 250 W metal halides. The biggest have grown to about 4" across.