I have a 20gal with about 12 mixed molly/platy. It is a bit deep. At any rate I really wanted something to keep the bottom interesting. Since everyone swims moslty near the top. I think a snail would be very pretty But I keep hearing Horror stories about monstrously fast Snail Population Explosions and taking over the tank. "the gravel now looks like its alive there are soo many baby snails"..and so on. The pics are incredible! I just want 1 medium snail with a pretty shell. Should I just abandon the idea and get ghost shrimp?