ID help on three things please

[SaltyGirlMom]

Did some online searching but still need help :)

One of my scallops died and when I pulled it out of the tank I found this large black spot on it. Did this part just decay? I also saw some info online abt ppl finding black sponges on their scallops and such. There are some small black spots on the bottom of a leather coral that was next to it and I’m wondering if something spread (altho the leather is still fine.)

Removed an internal filter and found a bunch of these things (slugs, snails?) on the back of it…

And are these fan worms? TIA!

 

[Gumbies R Us]

2nd is pineapple sponges, harmless filter feeders
3rd almost reminds me of a feather duster (any way you can get the photo under white lights)

 

[SaltyGirlMom]

2nd is pineapple sponges, harmless filter feeders
3rd almost reminds me of a feather duster (any way you can get the photo under white lights)

Pineapple sponges! I’ve heard of those. Thanks, that makes sense. And here are two more pics of the worm or duster. (Please ignore phone reflection).

 

[EnterName]

2nd is pineapple sponges, harmless filter feeders
3rd almost reminds me of a feather duster (any way you can get the photo under white lights)

Pineapple sponges! I’ve heard of those. Thanks, that makes sense. And here are two more pics of the worm or duster. (Please ignore phone reflection).

I would guess Serpulidae or Sabellidae depending on the material of the tubes. Most of them are harmless filter feeders, I think there are a very limited number of "bad" ones but as long as thex Don dig into coral skeleton or tissue you are fine