Forget the pleco, that feeding them so they will not suck on the slime coat is.. bs. They will sneak some slime coat from the bichir eventually no matter how fat and happy they seem to be. I used to keep a couple bristlenose a while ago, but no matter what they couldn't resist the temptation, eventually the bichirs would get the blotchy look on them. Those members have not kept them together long enough if you ask me. Another problem is aggression, some plecos can be pretty pushy towards other bottom dwellers, even the little bristlenose. Bichirs are peaceful, besides the occasional ornate from the many species I have kept.