Bleaching?

[Ben Summers]

Got a new coral 2 weeks ago, pet shop gave it to me to free up space, called it a 'lord brain' but couldn't tell me anything else on the name or species. Went away for a day or two and noticed when I put the light back that there's a bleach ring around it. How do I get it to recover?

 

[Red_Beard]

did you leave the light off while you were gone?

What kind of lights are you running and what are the No3 po4 levels in your tank? That looks like a relatively new tank, could be that it is starving.

 

[Ben Summers]

did you leave the light off while you were gone?

What kind of lights are you running and what are the No3 po4 levels in your tank? That looks like a relatively new tank, could be that it is starving.

I left the light off for about 30 hours
Calcium 400ppm
KH 10
Phosphate 0.25ppm
Magnesium 1250
Nitrate - 5-10ppm
pH 8.2
Nitrite 0ppm
Ammonia 0ppm

 

[Red_Beard]

That is likely played a large role in what you are seeing. A big shock going into a new system followed by a period where it wasn't getting any light. Keep it stabile and normally lit for a while and watch what it does. It should puff back up. When it does puff up, see if you can get it to eat.