I have personally kept 3 common plecos with bichirs over the years and have never had an issue. I watched a large one try to settle on my senegal once, but the bichir put up his spines and the pleco never tried it again. It might depend on the individual more than you,d think.
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so..the conclusion is,most pleco will not work with bichir,execpt bristlenose and gold spot plec?i think i will skip these guys,cause i think my fish can swallow these two plec,especially my aro and gar,and it will just injure both of them.i think i will just clean the tank manually like some of you guys suggestion
dont think a 25" gold spot pleco L001(Pterygoplichthys joselimaianus) can b eaten by ur aro or gars