New tube worm grow out

[titus]

Hello,

Just notice something neat in my sump recently. There some of what looks like to be tiny tube worms growing upside down along the wall of my sump.

I use tube worms, instead of feather duster, or fan worm because that's what all my fishing buddies call them. Besides, it's no ordinary feather duster and fan worm. It looks different than the ones typically found in stores.

But what I found interesting is the fact they are growing upside down. Maybe a way to avoid light but I wonder why.

Titus