Flagtail. Plecos are poop machines. Flagtail poop just mists out. I keep a large flagtail with 6 bichirs. Never bothers them. The key is to have driftwood for the bichirs to hide under.
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When I had 4 flagtails all over 7" they could coat my sand with a fine coat of poop. Not quite plecopoop but not exactly clean fishies by any means...