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Invigor
08-29-2005, 03:40 AM
the small white semi-circular things...possibly baby snails? they're about 2mm wide, use the tube worm for comparison. there are about 20-30 of these scattered on the rocks.

http://invigor.sasktelwebsite.net/snails.jpg

Samw
08-29-2005, 03:54 AM
Limpet

http://www.woodbridge.tased.edu.au/mdc/Species%20Register/limpets.htm

Johnny Reefer
08-29-2005, 03:57 AM
Limpet. Probably Acmaea sp.

Invigor
08-29-2005, 04:04 AM
hmm, cool. by the sounds of them they sound helpful moreso than harmful?

Johnny Reefer
08-29-2005, 04:20 AM
Hard to say. Not sure what species you got.
Just reading up on them with a book in front of me here (Calfo & Fenner).
"Voracious algae grazers that are not always useful for the mixed invert aquarium."
"Most are herbivorous, some are predatory..." [Coral grazers. Carribean Orange (Lucapina) and Black Limpet (Scutus)].
Also, this...."Even among the algae grazing species, they can be devastating to desirable algae forms like corallines...."

I'd say keep 'em, but monitor what they are up to! :eek:

Cheers,

PS Apparently there are claims of them causing abrasion to acrylic tanks, too.

adidas
08-29-2005, 06:08 PM
yup limpets. i have a bunch in my tank, on my crab and snail shells.