I'm wondering if plecos will eat the poop of other fish, specifically Molly fish. I've heard they eat algae growing on the aquarium walls but I don't know about what else their diet may include.
I'm very new with aquariums.
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I don't think they will try to eat fish poop unless they're starving. They are great at eating algae off glass and (smooth) rocks and wood though. I would definitely get some sinking tablet or pellet type food for them just to make sure something gets to the bottom, past the mollies.
A pleco would also probably love you for throwing in some frozen bloodworms.