need some info please

i was wondering if anything is wrong with my GSP. when i turn on the lights in the mornings hes turns bright lime green. but within ten minutes he turns deep forests grren and has a black belly seems happy though loves to eat play chase finger across top of water but he dosent turn green till next morning. is there anything wrong with my little guy?? please help... oh yea he is in a saltwater tank for about a month now has always been this way..none of the other fish bother him either... 30 gallon:-[

 

You will notice that many fish change color at night. It is a camoflauge reaction. Most of my fish change also. Everything is normal.

 

thanks i was just wondering cause he turns that color like 10-20 min after the lights come on but he turns lime green for like the first 10-20 the lights come on in the morning