I turned down the flow to take some pictures of my frags, and my
pencil urchin started climbing up the glass (it never does that).
After a few minutes it started releasing LARGE amounts of 'reproductive stuff' into the water. It did this the other day a little bit, but with the flow at full blast it wasn't as dramatic then.
Anyway, here is the pic for your viewing pleasure:
http://www.electronicauto.com/reef/urchin_spawning.jpg
===>DavidC
EDIT: notice how cloudy the water looks! The corals are feasting tonight.