ID sponge? is there any concern?

[tjs1200]

I've attached a couple of pictures, they look like some type of sponge, if so can someone ID it and is there any concern that they are in the tank? In case it is not clear they have a greenish tint to them.

Thank you

 

[vetteguy53081]

I've attached a couple of pictures, they look like some type of sponge, if so can someone ID it and is there any concern that they are in the tank? In case it is not clear they have a greenish tint to them.

Thank you

Its a tunicate and a filter feeder. I dont mind them. Some people do. Up to you if you want to remove or keep

 

[tjs1200]

Thank you, I will let them filter feed away.

 

[Mr_Knightley]

Not a tunicate, a species of cryptic sponge. They are harmless, I've got three colors of them in my tank, white yellow and orange. Tunicates are singe-bodied organisms with two small siphons, they grow in clusters and are pretty distinctive. Sponges are fully amorphous and have many pores, holes and lumps all over.