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Assuming you got just a regular old run of the mill plecostomus, yes. They are catfish and bottom feeders and enjoy algae, spirulina wafers and the odd vegetable like Romaine lettuce, zucchini and cucumbers.
Just be aware that not *all* plecos are that way. There are several species that are carnivorous scavengers. The Leopard Pleco prefers meat, both the zebra and chocolate zebra are meat eaters and there are others. Always check with the store before assuming one way or another.