Bushy tubular ellipsoid

[bromion]

I have a number of these white, bushy, tubular elipsoids in my tank. They are all pretty small right now, maybe 5mm in diameter. I've attached some of the best pictures I can manage to get.

 

[Fluff]

I have a number of these white, bushy, tubular elipsoids in my tank.

We like to refer to them as Q-tip sponges. Harmless filter feeders.