Hi...I have a 10 gallon hospital/quarantine tank that I keep a few small fish in to keep cycled. Tonite I noticed a small snail on the glass, only about 5 mm in length. Quite a surprise since I haven't ever kept snails. He must have slipped in with the addition of fish (interesting because I net out my fish and dump the lfs water after acclimitization). Ok...question...I've heard horror stories about out of control snails overruning tanks. Should I get this guy out of there now or let him hang. I can't tell the type yet. Brownish/gold shell. Thanks. SH