the problem your having is that the mbuna species(ur yellow's is part of that family) are algae grazers just like your pleco lol. i would suggest taking cucumber or zuchinni, skin it, and place it on a fork, warm it under hot water a lil and place it by where the pleco is, then change it out couple days later. There are other methods to holding the cucumber or zuchinni down too, i sometimes wedged it between some driftwood and glass or something.
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