Haha...thanks but I'm pretty sure it's not aptaisia. I've had that tank running for over 2 years, haven't added anything in a long time and never had aptaisia in it. I also have another thank with aptaisia problems, so I'm used to dealing with them.
I am more afraid that it's one of these...Eunice worm
They seem to share the same mouth...multiple tentacles at it's entrance.