Good or bad?

[Charbel.eid9]

I bought this coral from 1 month. I noticed now that there are 3 white strokes growing from the left, and a dark worm in the second pic? Any idea what these can be? Or is this good or bad?
Thank you

 

[mr_X]

the three white things are sponge. i can't make out the dark worm. some sort of polyclad flatworm i'm guessing. hard to say if it's good or bad. do you see it damaging anything? are you losing zoas? maybe he's eating that sponge?

 

[Charbel.eid9]

the three white things are sponge. i can't make out the dark worm. some sort of polyclad flatworm i'm guessing. hard to say if it's good or bad. do you see it damaging anything? are you losing zoas? maybe he's eating that sponge?

The black worms (around 3) was there when i bought it and the zoas are fine.
Concerning the sponge, should i remove it or it is fine to keep it? And if i want to keep it, what does it need? Thank you

 

[mr_X]

it won't hurt anything. you can leave it there, if you like the look of it.
Sponge - Wikipedia, the free encyclopedia
it doesn't need anything more than you are already providing.