Green acro problem

[hairalgae85]

Have about 30 or so 3 inch frags in 180. Alk 8, Cal 430, less than 5 nitrates and .05 po4.

One of my green acros , which is about 4 inches tall, has about an inch of it showing white, its midway down coral. Polyps there are recessed, you can see them, but recessed enough where you see white skeleton around it.

Tries uploading a pic but it failed to do so.

Any ideas what would causes this? No fish in tank at moment, going fallow for ich

 

[C.Eymann]

Have about 30 or so 3 inch frags in 180. Alk 8, Cal 430, less than 5 nitrates and .05 po4.

One of my green acros , which is about 4 inches tall, has about an inch of it showing white, its midway down coral. Polyps there are recessed, you can see them, but recessed enough where you see white skeleton around it.

Tries uploading a pic but it failed to do so.

Any ideas what would causes this? No fish in tank at moment, going fallow for ich

Try using a site like imgur or photobucket. Hard to give you advice without pics.