Micro Reef Tank - ID sponges?

[Micro Reef Tank]

Hi from what I read this seam to be sponges

Can some one please identify them

I am a little worried on the one in the zoanthus, can they hurt the zoanthus

 

[Lovemyreef2015]

It is sponge. Not sure of a exact scientific name. We do have the same ones in our reef. The one in the first picture we have growing on a rock with rastas and it's smooth until we feed the tank then it gets spiky like in your picture. They don't seem to bother anything but I've heard of sponge covering corals as they grow which will kill them. It should be easy to remove from the zoas. You can try and put what you get off near a rock so it can grow there. They are filter feeders and I good sign that your tank is maturing.

 

[Micro Reef Tank]

Thanks for the Tip
I will update when decide what to do

 

[Lovemyreef2015]

You're welcome