Sunflower Zoa problem

[richardhao]

Good morning, as you can see two polyps of my sunflower zoas seems "burned"??? I don't know what happened, I just saw it this morning. My water parameters are Ph 8.4, NO3 and PO4 are undetectable, Alk 13, CA 500. All measured using API test kits. Is it a disease? Thank you..

 

[DrBegalke]

How long have you had them under the same light?

 

[DrBegalke]

I don't think a diseae, but possibly a change in coloration secondary to a change in lighting.

 

[Reef Bass]

Doesn't look diseased to me either. Alk 13 and Ca 500 is a bit high. Could be an adjustment to water and lighting if they haven't been in the tank long.

 

[richardhao]

I'm using an ATM 20000K 150 watts double ended Metal Hallide. The zoa's been in the tank around 4 to 5 months more or less, started with just 3 polyps. I'm using teco reef salt. My tanks water volume is around 110 gals more or less, running a bio pellet reactor, dosing 55ml of alk, 40ml of vinegar, 5ml of vit c (syrup for kids). Do you guys think it might be the alk?

 

[650-IS350]

Stress. It'll recover and look like the rest of it's siblings.