they only come out at night
 

I took a peek at my tank this morning at 4:30 am noticed 15 pale green little slug like creatures stuck to the front wall. When I turned on the light to get a better look they all took off down the wall and under rocks. Are these likely to be worms, snails with no shells, slugs or baby nudibrachs?

cheers
shirley

they only come out at night
 

Sounds like a Stomatella snail. I'll try to find a pic for you ;) .

they only come out at night
 

Stomatella pic

BTW i've seen these guys only 3 times during the day since I started reef'n about a year ago :D .

they only come out at night
 

Are they good to have in your tank?

they only come out at night
 

They are good. They eat diatoms.

they only come out at night
 

Yes, they are good. Sounds like you have a nice sized population.

Hehe I call'em the graveyard shift :D .

they only come out at night
 

I also know of a few fellow reefers, including my self that have these things multiplying like crazy in our tanks.
Lots and lots!