Acan Polyp popping off?

[Tyler Bullock]

I had 3 small colonies of Acans. Grew them all from 1-3 polyps to 7-10. One is about 1.5 years. Other two are about 8 months old in my tank. They were all growing quite well. Have not moved them at all. Haven't changed anything. Lights, Flow, feed them 1-2 times a week. I do a 20-30% water change either every week or every two weeks. Neo Marine Salt. AI Prime set to the AB+ spectrum from BRS and have been running that for probably 6-8 months.

Anyways.

One by one. The heads started popping off one colony. Then another. Then another. Now the other colonies started doing it as well. The two that i have left still look big. Eat well. They are getting about 170 par at peak, and about 140 at the low. When I feed both of these corals I see that the flesh is no longer in between the heads like it once was. Just like the first colony that has left me.

Parameters are pretty consistent.

Alk = 7.6
Cal = 425
Mag = 1450
Salinity = 34.8
N03 = 3
P04 = .05

I dont know why this is happening. I don't think it is two much flow. I don't think it is to little light. I run Carbon sometimes. I have two clowns and a cleaner shrimp.

 

[DSC reef]

Seeing your chemistry, lighting and flow have not changed I'd keep an eye out on the shrimp. After keeping one for years it would steal food from the acans and damaging the flesh. I'd also look at your acans at night, s few hours after the lights are out to see if anything is bothering them. Sorry to hear.