What's on my Zoanthids?

[Beausoleiljacob]

Hi! I just noticed this huge white mass under my Zoanthid colony any clue what the heck this is?

 

[Tautog]

Looks like a sponge, harmless

 

[McMullen]

I can't tell from the photo but I've seen enough SciFi movies to be worried!

 

[Beausoleiljacob]

Looks like a sponge, harmless

I'm currently treating Dino X. For a Dino breakout. It says in the bottle that it kills sponges. Does it look dead?

 

[Tautog]

It's hard to tell by the pic, but I have them, and there's more I don't see, I'm sure. I don't know where they go, but they do, and they don't seem to hurt anything. If it's filtering the water, why kill it? They usually don't get that big, but they do disappear from time to time

 

[Tautog]

Hey, just looked at your pic again. Does this thing have small tenicales ? If so, it could be that bad Anenome, or a rock Anenome.
Remember, just like a garden, if you don't like it, rip it out!

 

[Beausoleiljacob]

Hey, just looked at your pic again. Does this thing have small tenicales ? If so, it could be that bad Anenome, or a rock Anenome.
Remember, just like a garden, if you don't like it, rip it out!

It's hard to say. Maybe. But wouldn't that cause the polyps of the coral to close. Here is another picture.