you aint guna reduce it. at all. unless you just stop feeding them. a crapping pleco is at least a well pleco. take a picture so we no wat kind it is, but sounds like a common, so they are onivorous but main diet is based around veg. esp when younger. i feed my plecos every day, on zucchinni, cucumber, potatoe, shrimp, bloodworms, brocolli, whatever. just dont leave it uneaten in the tank, cause it will foul up the water.