Yes definitely if the Pleco is not properly fed then it is quite likely to start sucking on other fishes slime coat, ganoid scaled fish like Bichirs in particular as their slime coat is thicker and more nutritious than on many other fish. A lot of people here will tell you to never even house Plecos together with such fish because of this, as a compromised slime coat usually equals a dead Bichir.I have a 4 and a half inch pleco in there with him. Could it be possible he is a suspect?
Look closely it almost looks like the slime coat has become loose or shredded.are you talking about the white coloration on the nose? If so it looks like when mine runs into the glass. As far as darker coloration it is probably the substrate my sen got real dark when it was on black substrate
Look closely it almost looks like the slime coat has become loose or shredded.