Acanthophyllia loses color please help

[Thue]

Hello

i have 4 Acanthophyllia deshayesiana in different color, 2 green and 1 red and 1 in rainbow color. The green and the red looks perfekt, but the rainbow has over the last periode lost a lot of its color, it looks like its is bleaching and turns transperant.

They are all in the same place in the tank so i cant find out what is wrong whit the rainbow, does any body have an ideea what could be wrong ?

My Water paralements are good
kh 9
ca 450
mg 1450
po4 0,02
no3 5-8

My light is t5 and mh over the tank

Hope some body can help my, i hate to lose this beauty coral

Regards Morten
Denmark

 

[rockslide123]

How are they positioned in the tank relative to the lighting (i.e. which ones ar e in brighter light which ones in dimmer?). These don't like much flow and do much better with occasional (weekly) feeding.

 

[Thue]

They all sits on the buttom, in low light, the flow is also low around them, i trey to feed them all that i can with small pellets and mysis, 1-2 times per week. They sure like that

They all sits in the same amount of light, but maybe i shoud try to put they rainbow in some more shadede area