Urgent What is this on the zoanthids?

there was literally nothing on them yesterday and they looked fantastic... I can't get a break! I will prepare a dip in a second but I will appreciate if anyone can tell me what this is

 

it looks like a bunch of dust covering them. They are slightly green too

 

Possible nudibranchs. Eggs could've hatched as typical dips don't kill them. They can even mimic the coral and color that they are eating. A few dips might be in order.

 

I dipped them for about 30 mins yesterday as the dip suggests, though all the sprinkles that were there are still there.
Half the colony still closed up. Im hoping I didnt kill them with the dip :/

 

Give it some time. In my experience zoas and palys can be a difficult coral to keep. We've had all kinds from rastas to hornets grow like crazy then close up for a week with some die off while other colonies are open and happy.

 

So im looking at the colony a little bit closer and I could swear they look like Nudibranches. I will post pics in a second. I am also doing a second dip with double dose (directions say its safe to do so).
How often and how long should I be doing these dips? (after I dont see the nudis ofcourse, but should there still be eggs after?)

 

Make sure you have adequate flow while dipping. I make a gallon of coralrx pro at a time with a power head in the bucket. I normally dont go over 10-15 minutes. Most likely there was eggs that hatched with that many nudibranchs. You can also manually remove them in between dips as well.

 

Can't see any of the pics due to bandwidth being exceeded.