I have some self-reproducing cap snails in my tank. I got 3 from a fellow reefer on a frag and now there are tons. They cycle w/ my cleaning schedule. When the coralline hasn't been cleaned for a while there is no film algae for them and thier numbers dwindle. When I keep up with the coraline there is enough film algae on the glass to keep them pretty numerous. They hate light, which is good b/c they don't block my view of the tank during the day. In any case, live propigation of snails is possible, you just need the right broodstock.
Bert
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