Coral Fading

Hello, I recently got back from a trip, and my coral seems to be not doing very well. Some of my easier species are doing just fine such as my GSP, Xenia, and Candy canes. However my hammer has shrunk considerably, and my Acans are showing skeleton. Also a new Acropora frag has yet to extend its polyps. I did a few tests and my levels seem to be reasonable. My ammonia could be a bit lower. I was wondering if you guys knew of anything that could cause these corals to act like this? Calcium levels? DKH? Any advice would be appreciated

 

Giving this a bump up for you hope you get some responses today

 

What are you nitrates and phosphates levels and what your alkalinity at as well and do you have any crabs or peppermint shrimp in your tank ?

 

If you have ammonia, your tank is not cycled. Ammonia should be at zero.

 

Corals can not handle ammonia. That’s your problem. Water changes ASAP. Get your levels in check.

 

Hi,
Acans and hammers are quite sensitive to parameters. Even in a stable established tank, they can still be a bit tempremental.

Ammonia definitely won't be helping, and spikes in temperature can quickly and dramatically affect corals.

As for parameters, a general guide for a reef tank is
NO3 target <4 ppm, closer to 0 is better
PO4 target <2 ppm, closer to 0 is better
Salinity target 31-33ppt SG 1.024-1.026
Temp target 77-79F
pH target 8.0 to 8.4
Alk - 8-12 dKH, 8 for softs, 10+ for LPS/SPS (Hammer and Acan are LPS)
Ca - target 400-460ppm
Mg - target 1200-1400ppm