Yellow round sponge

Swede Reef

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I just received a zoa frag and it came with some small yellow critters. The zoas where dipped in Seachem iodine based coral dip. These guys seems to quite well and puffing up. Only in the tank for day since receiving zoa frag. Any ideas? yellow ball sponge? Good or bad... Thanks for your help.

20210513_093707.jpg 20210513_093633.jpg
 
Zoanthids

IKD

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The two on the side look like closed up zoas. Since this post is a few weeks old, is that what you see also now?
 

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