I´ve heard that plecos and bichir can´t be in the same tank. Never had any
problem with my fishes though. Got three L001 togheter with a poly senegalus.
Bichirs
Rays/flounder/sole
Cichlids
Lungfish
Any kind of fish that doesn't move too much or have large easy to suck on sections (such as above) may or may not have problems with slime disc sicking... but then you can with any fish.
Can be problems with other bottom dwellers, especially the nocturnal ones. Vary variable through the species and how you keep them and the individual really. Trial and error best summed it up.