Black Reddish Sponge good or bad?

[lonewonderer]

Hey there! I just wanted to know if this sponge is bad for my tank. I bought a colony of zoa and after 2 months that sponge appeared. Is it a good thing or bad? TIA

 

[blaxsun]

It sounds like it's a nuisance more than anything else.

https://www.reef2reef.com/threads/black-sponge.378507/