watergardenut
New Member
I am a rookie at saltwater aquariums, but have been loving every minute of this challenge. I have a pencil urchin which this evening I noticed it excreting a milky white, almost smokelike substance from what I think is the topside (maybe it's the bottomside). It is still alive and moving around. What am I seeing? Does any body have any idea? Please advise. Thank you.