Maybe colinistas (spelling) if so then the two you see probably represent hundred that are hiding out. You see them come out mostly at night and they look like they're overwhelming the entire tank. But really they're awesome at keeping your rock looking clean.
Doesn't look like a colonista snail looks more like an astraea snail.
Snails will definitely breed in the aquarium. Myself being fishless for 10 weeks my snail population exploded with hundreds of babies all over the place.
yeah snails definitely breed in aquariums. some leave strings of eggs, and some looking like they're smoking releasing the eggs. I had a trochus snails breed recently and now I have baby snails ALL over the place
I have one of those in my tank that came in as a hitchhiker. I'm not sure what it is but do not believe it is any of the 3 snails mentioned. It is just slightly smaller than an astrea. I've been watching mine for about a month and the thing does nothing but go around the live rock. It does also tend to only come out at night. I'm still keeping a eye on it b/c I have no idea what kind of snail it is but does not 'seem' to be a problem one so far.
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