Does anyone know what this is?

[34gallonSolana]

Good morning reefers. Over the weekend I spotted these two things, looks like they may have came in attached to the plus. I guess if I would have examined my tank more closely I probably would have notice it growing. Don't know what it is. Does anyone one what it is? Do I need to worry about it? One is growing wrapped up around the outer edge of the frag plug and the other is on top of plug growing along side my leather coral. It is hard to the touch.

Thanks,

 

[laverda]

Sponge. Filter feeder. Can get a little ugly if they get out of control. Put it in your sump if you don't like it. Exposure to air kills most sponges fairly quickly.

 

[34gallonSolana]

Sponge. Filter feeder. Can get a little ugly if they get out of control. Put it in your sump if you don't like it. Exposure to air kills most sponges fairly quickly.

Thank you, really appreciate it.