Disappearing skirts on gobstoppers

[damselindistress]

Can anyone help me with my gobstopper palys/zoas (I don’t know which they are lol)? They’ve been doing fine and I see two new heads that haven’t fully sprouted yet then this last week I noticed part of the skirt missing on one of them but every day more skirt tissue disappeared eventually affecting all of the polyps. I don’t know if it’s a disease or a predator??

Current stats
9.8 alk
468 calc (I’ve since titrated dosing pump)
7.8 ph - low but stable
78-79 temp
Haven’t tested phos/nitr in a few weeks

 

[Crabs McJones]

Disappearing skirts can be a symptom of zoanthid eating nudibranch. Are you able to dip the coral and see if anything comes off?

 

[bsn_rn_cen]

Mine did that once. Never figured out what caused it but they bounced back with new growth

 

[Fishy_mcfish]

Maybe check at night with a flashlight. Could be nudibranchs. If it is they will be pretty close to the same color as the zoa so you will have to look closely.

 

[damselindistress]

Thanks everyone - @Crabs Mcjones they are grown to the live rock and it’s a large piece that forms a bridge which is glued in place, no way to get it out to dip it ;Sorry.

I shouldn’t mention that I have spotted several bristle worms of late - could they be munching on the zoas? I’ll start checking with a flashlight tonight for nudis but I have not seen any before and there’s not been anything added real recently although I know that doesn’t mean they couldn’t be there. If it is a nudi what do I do - pick it off?

 

[Crabs McJones]

Bristles very rarely bother corals. Zoa nudi are very hard to see

Thanks everyone - @Crabs Mcjones they are grown to the live rock and it’s a large piece that forms a bridge which is glued in place, no way to get it out to dip it ;Sorry.

I shouldn’t mention that I have spotted several bristle worms of late - could they be munching on the zoas? I’ll start checking with a flashlight tonight for nudis but I have not seen any before and there’s not been anything added real recently although I know that doesn’t mean they couldn’t be there. If it is a nudi what do I do - pick it off?