Fungia Plate Tentacle Question

[adumb112]

Any idea what would cause my fungia plates to retract their tentacles?
They are haven't released their tentacle for about a month.
They are still eating and opening their mouths.

Salinity - 1.025 (Brightwell NeoMarine)
ALK - 8-9dkh
CAL - 460
MG - 1500
PO4 - .05-.08
NO3 - 10

They are in the sand bed of my tank and getting about 80PAR.

Example below......

 

[Wasabiroot]

May want to look at your ammonia levels. Also, are your parameters consistent or have they fluctuated lately? I find with any temperature spikes my fungia get grumpy. The other thing to watch for is nipping from fish. Finally, you could try moving it to a shaded region. If it's still eating fine, something is probably irritating it.

 

[adumb112]

May want to look at your ammonia levels. Also, are your parameters consistent or have they fluctuated lately? I find with any temperature spikes my fungia get grumpy. The other thing to watch for is nipping from fish. Finally, you could try moving it to a shaded region. If it's still eating fine, something is probably irritating it.

Yes...my parameters pretty consistent, but I did add a green clown goby, about 5-6 weeks ago, which tends to nest in that area. I've never seen the goby nip, but it could be happening at lights out.

 

[Wasabiroot]

Clown gobies LOVE perching. Might be worth looking into. Otherwise it appears healthy and isn't bleached, so it should be ok if that's the cause.