I have something throughout my live rock that intermittantly spits out a brown substance into the water column. I am wondering what is doing that. I can't see anything from a visiual inspection.
I'll bet it's a spaghetti worm. Do you see some skinny white threads and maybe a tube covered with your substrate near where the brown stuff is being spewed out? That's your worm, umm, regurgitating :wink: