Is that a fireworm? And black blob eating thingy ID bonus

[fr3n0z]

Hi guys, just spotted this guy in the tank, not sure if is long since as soon the light hit him it retracted back, someone can confirm is a fireworm? Should i try to catch him if i see him and discard it (or sump it)?

And also, in the video you can see some things that i tought where black dot but they are actually eating, they seems to work similar to vermitid snail but they look different, it seems like a black dot/blob. any idea in what is it and if i should try to dispose it as with vermitid?

 

[Doctorgori]

never seen that before so I’m following

 

[ISpeakForTheSeas]

The bristleworm there is pretty cool, but I have no idea the species - sorry. Honestly, my best guess is the black thing is a pair of vermetid snails (the big, obvious one in the middle, and a little one down on the bottom-left of the big one's shell) - if you can, I'd test to see if it's got a hard shell just to verify.

Either way, great video there, and those are some pretty neat hitchhikers.