Acropora Help!

[vitalis]

I recently bought a small Acropora for a really cheap price and noticed that the polyps were only covering some parts of the rock. Is there anyway that i could use a supplement to bring back the polyps and help them thrive. I already use Iodine, Strontium, and Magnesium in addition to the regular feeding of phytoplankton and other mixtures. Is there anything else i need to do to help bring back the polyps. Any help is greatly appreciated!
(I already have experience with soft corals but this is my first time with stony corals)

 

[ibew41]

can you post a pic?and welcome to the board

 

[jam1e]

You might have better luck with replies if you post this in the SPS forum.

 

[jackri]

What's your lighting like and what are your calcium levels and alkalinity levels?