Chalice loosing tissue

[reefrider]

My chalices and acans are deflated and some are loosing tissue. My tank is 13 years old and my parameters are

NO3 0ppm
PO4 0ppm
Ca 375ppm
Mg 1250ppm
Sg 1.026
Alk 9.6dKh
ph 8
Temp 78.7

Any ideas?

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[Reef Frog]

What kind of lighting do you have? New frags? Is the chalice on the sandbed?

I've lost my fair share of chalices to tissue recession on the sandbed for reasons unknown. I like to get them mounted fairly quickly.

Not sure if it is causing your problem, but your alkalinity & calcium are a little unbalanced. I did better with chalices when I moved my alk down closer to under 8 dKH, closer to natural seawater.

Your acans look deflated, not receding from what I can see in your photo. That's often to high a light intensity. Good luck.

 

[snorvich]

Low flow, low light.

 

[reefrider]

I have had this chalice for 5+ years. I run 2 175w MH and 2 VHO 110w. The chalice has receded in the past and recovered, but I have never had it this bad.