Sounds like a peanut worm. Not sure about the "smoke cloud".

Teri
http://home.comcast.net/~76fex

"Bonita" wrote in message
ps.com...
I was feeding my tank tonight a saw this "smoke cloud" floating around
size of a quarter, fish went nuts trying eat it?

Also saw this light orange long round worm like thing (was not flat)
come out from inside of a very smooth live rock piece, the whole in the
rock was the same size in dia. as this thing, it crawed out of the
whole like eels do but not all the way and grabed a piece of shrimp and
quickly went back in whole.this guy was thick as a toothpick maybe a
little thicker, 3 inches at least came out, I freaked out!! What was it
this creepy thing?