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The long skinny one is a cerith snail. The other one is an astrea snail.
They are both good guys in large numbers, one of each isn't going to make much of a difference.
Definitely leave them in the tank, they won't do any harmThanks guys -- I guess my questions should have been "Should I remove these, or are they ok to leave in the tank?"
they're about $1.00-$1.75 each at most LFS in my area.
