Thanks for taking an interest.
This tank has been set up for three years. It has a wet dry filter and a Magnum cannister filter. It doesn't have much in it, but they've been there for going on three years: a yellow tang, a Mandarin goby, and a couple of damsels. Two recent damsels and a 2.5...
I've got a well-established 30 gallon marine tank that has developed what I would call an infestation of what look like tiny tube worms.
They create tubes in the sand and have several tentacles about 4 or 5 mm. long, and they retract in response to light or movement.
I saw a couple a few...