Some coral healthy, others dying?

[chickendude10]

Hi everyone,

 

I’ve had my Nuvo 10 up for 4 months now. My euphyllia all seem to be doing well — one branch has started 6 tiny heads off the main stalk. 

 

I also have a piece of hynophora up high that is vibrant and usually extended. 

 

Ive gone through a couple pieces of Acan, however, that don’t extend in my tank. I also have some favites that have slowly been losing color and fading away. 

 

I’ve tried a couple different locations for variation in lighting and flow with no real success. 

 

Any ideas on why acans and favites might not be doing well?

 

Pics:

Hammers and one acan when it was first added 

Same acan now—does not extend 

 

Specs:

Nuvo 10

AI Prime+ 

No chemical filtration

Weekly 2 gallon WC

Alk 7-8

Calc 480

Mag 1500

Nitrates 1

[Firefish15]

Have you been feeding the corals? Both of those species benefit from added food.

[burtbollinger]

Any shrimp in tank?

 

alk swing?

 

acans can also just be weird sometimes 

[chickendude10]

I try to feed the acans and hammers once a week with mysis. The acans used to readily pull them in but now ignore the shrimp. 

 

Only inhabitant right now is a yasha hasha goby. 

 

Alk Swing could be an issue. It usually varies from 8 after a WC to 7 at the end of the week. Is this enough to upset the coral?

[Clown79]

Too much light on some acan and definitely favorite can cause them to not expand. Alk swings definitely can cause issues with lps.