Dying Brain coral?

[Faucett]

Hey guys and gals, I've had my 75g for 2 years and do monthly water changes. With in the last two to three weeks my trech brain coral, which is typically greatly enlarged, has been shriveled and has lost a lot of its call. I have had the same lights for over a year (LEDs) so I know it's not that.

My parameters are good:
Alk 8.6
Calc 390 (little low)
Salinity 1.025
Nitrates 0
Phosphates 0




Does anyone have any idea what might be going on? I've had this coral for years with no problems even when the tank parameters were off.

 

[Dav3]

What is the ph and temp?

Have you introduced anything new to the tank?

 

[Faucett]

Ph was 8.2 and I have introduced several sps corals two of which have died in the last week

 

[Faucett]

Sorry the temp ranges between 78-80

 

[Dav3]

Was the introduction of the sps the only change you've made in the past few months?

 

[Faucett]

I had low Alk for a week or two but it never got below 7.7 and the change wasnt abrupt it was over time. I dipped it as we'll I figured maybe it had a tear in it, but no such luck

 

[Dav3]

Is there any visual tissue recession? If not just observe it another week.

 

[Faucett]

During deflation at the end of the day near dark it does show a tiny bit. This is what concerns me because I know typically that means it's only going to recess worse. I'll try and spot feed again tonight...

 

[Dav3]

Maybe someone with experience with this specific type of coral can chime in.