What’s going on here?

[ReefJCB]

I’ve had this chalice for over 6 months and it had been doing very well with steady growth and great color.

I did a water change yesterday and noticed a weird black coloring later that evening.

The polyps are still coming out well and everything else seems fine. Any ideas?

 

[nautical_nathaniel]

What are the parameters of your water and what lighting do you have?

 

[ReefJCB]

Alk 9.6 dKH
Ammonia 0
Nitrite 2
pH 8.4

I’ve got reefbreeder photon LEDs set around 20 on all channels

 

[nautical_nathaniel]

We probably need to figure out what your Nitrate, Phosphate, Mag, and Calcium are like as well.

Does anything rub up against the coral? Like a fish or invert? I had a blenny make parts of a chalice die off because he liked to sit on it so much.

 

[ReefJCB]

Nitrate is at 2, I mistyped nitrite in earlier post. I need to get phosphate, mag, and calcium tests.

I haven’t seen anything rub against it. I’ll keep a closer eye.

The coral seems to be doing fine, no visible tissue damage. Polyps are coming out. It’s just so weird.