corals lose color

[oneradtek]

so it seems that all my corals don't have as much color as the rest of the pictures i see. my corals are healthy in appearance and grow, but my GSP and zoos don't have as much color as when they first arrived in my tank. They are all growing good, but no color?
2x175watt 15k MH and 2 x96watt actinics

 

[oneradtek]

for example this is a pic of zoos right after i placed them in my tank...

and here they are now after a month

 

[mach03infront]

how many gallons is your tank?

 

[oneradtek]

for example this is a pic of zoos right after i placed them in my tank...

and here they are now after a month

 

[oneradtek]

55 gallon , light sits about 10 inches off water

 

[sly65sally200]

gosh, i'm curious too
my stuff is mostly brown

 

[addicted2]

I am not sure..I will be watching this thread for answers..I am curious...your lights be strong enough..etc.

 

[jrthomas40]

they should be strong enough but how old are the lights?? and what K did they come from?

 

[nycbob]

yeah maybe its time to chng out ur bulbs. mh lasts only 6-8 months at most.

 

[jrthomas40]

if they came from a tank with 20k then the color is going to be different as well rather than your 15k...10k=good growth, poorly colored, 14-15k= ok growth ok color, 20k= poor growth, great color

 

[sly65sally200]

that's nice to know

 

[reefkprz]

lighting levels and nutrient levels are often the culprit for shifts in color.

 

[oneradtek]

sorry about the slow response time, but with holidays and all you know!....
The frags came from 14k MH and my tank has brand new 15k MH which i acclimated for a week with reduced duration and raised up more. They lost their color before i got new bulbs and now they have all increased in the growing they still have not gotten color back. I think i agree with the last comment about teh nutrient level. What can i add for color? like phytoplankton by Kent?