I have a cerith type snail that came in on my first batch of live rock. They only grow to about half the size of the ceriths that you buy at the store but they breed like rabbits.Also, maybe coincidence, but the population increases dramaticaly when i go through a bout of cyano. At the moment as soon as the lights go out they come up from the sand and take over the tank. Within hours you can barely see through the front glass.
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