What happened?!

[bmbpka]

So I came home from work, did my afternoon walk around of the tank. What in world happened to my chalice?! That was a full disk of chalice. The white part looks like a rib cage of a dead fish. I was in a rush and couldn’t test water (late for the doctors). The rest of the chalice looks fine and it definitely didn’t look like that last night.

 

[Crabs McJones]

That is the corals skeleton, its receding back because it's not happy for some reason. Parameters and lighting specs would help. How long have you had it?

 

[bmbpka]

That is the corals skeleton, its receding back because it's not happy for some reason. Parameters and lighting specs would help. How long have you had it?

I didn’t have time to check parameter. I will as soon as I get home from the doctors. It’s been in my tak for 2-3 months now and I haven’t touched the light.

Light is t5/led hybrid.

 

[DSC reef]

I would check for an alk swing if there is nothing near that could have stung the chalice.

 

[bmbpka]

Okay so here are the Parameters. Think the Alk is probably the issue?

Salinity 1.026
Temp 79.2
Ammonia 0
Nitrite 0
Nitrate 10 (probably a bit high)
Calcium 430
Alk 6.5 to 7

I didn’t have time for mag or phos but I don’t really have any concern with either of those. Plus I had to dart again.

Light wise, I have the t5 hyprid

2x Blue Plus
1x Purple Plus
1x antinic

T5 is on 2-8pm

AI prime HD with the following setting