What is this on Zoa

[Thor2j]

I am brand new to corals. Had salt water tanks for 15 years , now getting back in with a reef system. Added 3 frags from a LFS that I let my wife pick (don't ask), don't even know what exactly they are. 2 are Zoas and one is some type of mushroom from what little I remember, correct me if I'm wrong.

One of the zoas looks like it has some yellow "webbing spots" on the rock underneath the zoa. Don't remember seeing them there until yesterday. They have only been in there for 4 days. What are these yellow spots? Almost looks like spider eggs. I did soak the frags in CoralRx then used a turkey baster to blow any critters off but didnt see any.

Thanks.

These are the other 2 I got that I dont know exactly what they are.

 

[Carolina Clownfish]

It's hard to tell from the picture, but the yellow under the first frag appears to be some sort of sponge.

 

[FLAdaboy]

Sponge for sure but not sure what the first zoa is but second looks like some kind of people eater and third is a mushroom.

 

[Thor2j]

This might be a little better picture

 

[Tahoe61]

Harmless sponge.

 

[Thor2j]

Harmless sponge.

Thanks!!!!