Maybe a piece of driftwood? Do you have one in the tank? Common plecos need a piece of driftwood to suck on so that they get nutrients for digestion.
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29 Gallon tank
~6 Long Finned Black Tetras
~3 Bosemani Rainbows
~10 Serpae Tetras
55 Gallon tank - Planted
~2 Pearl Gouramis
~2 Platys
~16 Neon Tetras
~6 Glo Light Tetras
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