Can't seem find the light this guy lights

[imnotmike]

Right now it's been at the top of the tank other acros at the same
Color have bright colors this guy seems to not like the bright light any idea what type it is might help with where to put it

 

[imnotmike]

This is the acro I'm
Talking about

 

[imnotmike]

Ones cooking at the same level as it.