any of the loaches will do but clown loaches are the most voracious snail hunters around, plus when the obtain a larger size they command a higher price. I'd say if you're gonna get rid of snails do it right and make money back! Get clowns! other wise you can attempt to make a snail trap of your own. take a slice of cucumber and put it underneath a plate that is turned upside down on the bottom of your tank. leave it over bight with the lights off. wake up early in the morning and collect the critters. kinda effective but idk how effective it will be with u cause you have a pleco. but any ways clown!!