Blue mille not well? Help....

[miserkris]

Had this blue mille for 8mo. Hadn't grown.polyps arent fully out or waving.not blue.its high under 6x54 t5.

What do I do?

Other sps like rose pink mille doing great.

 

[Reef264]

What are your Calcium and Alkalinity Levels?If it is recieving Calcium but not enough Alkalinity, it wouldn't be able to produce Calcium Carbonate.It may be a Potassium Defficiency, Potassium is very important for Blue Pigments in SPS.