Growth around young, spreading GSP colony

[madadium]

Anybody know if this is something I should be concerned about or if it's just a maturing GSP colony? Started with a very small (1x1cm) piece from a friend 1.5 months ago.

Pictures taken at different times during the day (mid day and sunset as polyps retracted). Thanks!

 

[saltyfilmfolks]

It’s sponge.

 

[Mikedawg]

Yep, sponge I think; diversity of life forms adds interest, etc. to our reef tanks and you got a score IMHO

 

[madadium]

Thanks guys, doesn't look to be bothering the polyps! Score!

 

[Tony Sini]

Thanks guys, doesn't look to be bothering the polyps! Score!

Mine just did the same thing to the point it was not opening i blew it of with a bastered and now they are open again

 

[Softhammer]

Definitely a sponge. I’d be more concerned with the GSP growth. You are in it forever if you let those suckers roam free!

 

[Tony Sini]

Definitely a sponge. I’d be more concerned with the GSP growth. You are in it forever if you let those suckers roam free!

Ya i now its my girls tank on a island that and xenia she had to have was not putting it in mine so i set her up a 30g but its my tank to in the long run

 

[Tony Sini]

Ya i now its my girls tank on a island that and xenia she had to have was not putting it in mine so i set her up a 30g but its my tank to in the long run

She just likes looking at it

 

[Softhammer]

They are beautiful but holy cow, they are invasive!