SPS bleaching from underneath

[Sweet]

I have an SPS that is bleaching from underneath, not from the bottom, but from the side that is not directly under the lights. I have had this particular coral for over 6 months. I did frag a piece a while back and the frag is not showing this issue. None of my other SPS are showing this problem.

Anyone seen this before?

 

[Gary Majchrzak]

SPS is a hobbyist term that's not very accurate. Can you tell us if it's an Acropora, Montipora or ?

 

[Capt_Cully]

Are there polyps showing on the "bleached" side?

 

[Sweet]

I would have to say it's an Acro and there are no polyps on the bleach part of it.

 

[AmherstReef]

If the coral was Montipora Digitata, bleaching from the bottom could be from Montipora Eating Nudibranch, they like to start from the base and work their way up. Once eaten it looks white.

Just had to remove a large digitata from my tank after infestation.

 

[Sweet]

I made a water change and it looks it's doing better. It's difficult to say because it grow so slowly. I will keep on monitoring it.

 

[Capt_Cully]

Pics?