for aslong as i can remember ive had tiny snails invading my tank, they came in on the plants and decided to stay
however since i got a pair of blue rams all the snails have dissapeared and ive found empty shells scattered around the bottom. ive googled but not found anything about them eating snails and wondered if anyone has any experience of this. i'm not fussed about them eating them, if anything im grateful as i didnt have the heart to kill them by squashing and just ended up syphoning as many out as possible, but snails being snails they seemed to mutiply as fast as i removed them, so getting rid of them a natural way is a bit of a blessing 
p.s. I didnt know whether to post this here or in the new world section so apologies if its in the wrong place
p.s. I didnt know whether to post this here or in the new world section so apologies if its in the wrong place