Help - Acans are starting to die off

[Justfbilly]

I have an established 45 gallon reef tank that has been up for almost 2 years. I have not added anything to the tank for about 9 months. A few days ago I have noticed that some of the acans are starting to die off?
Water temp is 78 degrees
Salinity is 1.025
PH 8.3
Alk 9
Calcium 420
Mag 1250
Amon. 0
NO2 0
NO3 0

They are sitting on the sand and they are getting indirect flow. They have been in the tank for over a year and have always looked really good. Any ideas what might cause this?

 

[Tahoe61]

Have you added any GFO, are you dosing and if so how?
Are you feeding them?

 

[3mm3]

Get your magnesium up to around 1350. Do you spot feed them?

Also is there any coral near that side that could have stung it?

 

[A Toadstool Leather]

What did you test all your params with? If you used a refractrometer ensure its calibrated every time before use. Do you feed them?

 

[BoomCorals]

Almost looks like it was stung or nipped at?

 

[Shaddow_wolf169]

What kind of fish do you have?

 

[Justfbilly]

I have a yellow tank, 2 clowns and a 6 line wrasse. I am using the Red sea test kits and I am running GFO. I dose 2 part through a doser and I spot feed them 1 time a week. The only other corals next to them are other Acans.

 

[jd371]

Following. I'm having a problem too. I did add a CBB recently, but he's well fed and eats like a pig and haven't seen him pick at any corals so I can't say he's the cause. Mine are not full and puffy like they use to be, doesn't look like any flesh is missing or dying, just look deflated.

 

[roberthu526]

Mine are in a similar situation. I felt it was due to low nitrate but I am not willing to raise nitrate as a solution because I fear it would cause algae outbreak.

 

[Shaddow_wolf169]

I had a simular issue I raised nitrates by 5 points and the acans bounced back coral need the nitrates to survive.

 

[Tahoe61]

I would pull the GFO and see if they come around.

 

[3mm3]

I have a yellow tank, 2 clowns and a 6 line wrasse. I am using the Red sea test kits and I am running GFO. I dose 2 part through a doser and I spot feed them 1 time a week. The only other corals next to them are other Acans.

When you say you have other Acans near them are you referring to acanthastrea echinata? If so they will fight..

 

[cohlton]

Following. I'm having a problem too. I did add a CBB recently, but he's well fed and eats like a pig and haven't seen him pick at any corals so I can't say he's the cause. Mine are not full and puffy like they use to be, doesn't look like any flesh is missing or dying, just look deflated.

I'm in the same boat right now.. as soon as I added him my acans started to deflate :/ I've seen him "nip" once not sure if that's the issue