I keep a lot of dwarf bristlenose plecos and alternate feedings--every other day after I turn out the tank lights at night I drop in either a couple algae wafers (Hikari) or a piece of boiled zucchini. They zucchini really seems to make them thrive--you should try it some time. It's really neat. Even in a big tank (I have a 125 with 10 dwarf plecos) they find it almost right away and by morning, all 10 will be clustered right on top of it. For your three small plecos, one algae wafer at night should be fine...One other thought, since this is the planted tank board--I think the zucchini helps keep the plecos from eating some of my more tender-leaved plants!