brain coral turnign white

[bergamer]

why is this happening? it has been in my tank for over 6months and it is beginning to turn white.
atm it is on my sandbed of my 90g with 260w of PC

 

[rberhow]

From what I've read, LPS need a higher concentration of lighting than what you have. I may be wrong and hopefully you will get man more opinions but it may be slowly dieing from loss of light and that is why it has taken 6 months to occur. I'm assuming we are talking about an open brain??? If its a closed brain you could try to move it up in the rocks but open brains like the sand. In fact they need it to build their skeleton beneath them. BTW, pictures would be very helpful as well as your water parameters.

 

[fishieness]

i would agree that it may possibly be the lighting/placement. if it is a red open brain, they need more light than the greens. they are jsut found shallower.

 

[murph145]

i agree i think more lighting is needed for that particular coral if its being kept on the sand bed its losing its zoanxthel algaes

 

[xoxox]

Have you changed the bulbs in the PC, their spectrums only last about 6 months?
The lights might look O.K. but they could still could have gone bad.

 

[kdfrosty]

Also what are your water parameters, specifically Ca, Alk, and pH?

 

[alyssia]

Would 260 watts of PC lighting on a 75 gallon be enough for an open brain?

 

[sato]

The dimensions of the 90g could also be a factor as PC lights dont have the punch to get their full spectrum down as far as say MH lights so if its a 90g tall its going to get less light then in a 90g long.
But I would agree with most of the above posters that your problem is most likely lights as PC loses its spectrum quickly and 6 months is about at that time.