Chalice white spots

[aeceac6413]

Hi everyone,

I've noticed these white spots on my space invader. What is it? I did noticed some fish food on it that maybe a fish or a crab snatched up...irritation? I have lost an sps recently to rtn and now I'm freaked out. Will do water testing today and update the post. The one photo under white light was yesterday, the blue is today.

Thoughts?

 

[lil sumpin]

Looks like it's beginning to lose tissue. This happened to me very early on in my tank's lifecycle, I wasn't able to properly determine alkalinity consumption and dose accordingly and I ended up losing a bunch of LPS. What are your parameters like?