need help with sps

[THE MAD REEFER]

i have been nursing this sps back to health for about 6 months, it was only 1"square when i got it and it finally got its coloing back and is looking goo.

i know that the edges usualy look white when its growing but i noticed that the white is retreating back toward the conter of the coral is this normal or is something else going on that i am not seeing

heres a pic below, sorry for bad pic , had to use my phone
its on left side around mid point, been watching this happen for a few days now



thanks in advance

[lazylivin]

It may be tissue necrosis. Common in new tanks or when Alk is lower. It is important to run much higher Alk level in tanks then ocean unless carbon dosing. Consider a Alk of 9.5 - 10 with minimal flucuation day to day

Just to add I see it next to a chalice. At night they shoot out feeders that commonly sting nearby corals

[THE MAD REEFER]

since i moved the chalice down their its growing like a weed now

gonna have to move it over a little bit

will have to have my fiancee check alk

[Neogenesis]

Also not sure if you've added any other montipora, but nudibranchs are something to keep a eye out for.  They will eat across a monti like that.  I agree with Lazy though, I would think it's the chalice from your pic, it's awfully close to it.

[THE MAD REEFER]

thanks guys

had someone move it a little bit further down the bridge for me and well see how it goes from their