Can a male betta live in the same tank as a pocastimus?

Yes, a male betta can live in the same tank as a Plecostomus (often referred to as a "pleco"), provided the tank is spacious enough to accommodate both species. Bettas are territorial and can be aggressive, especially towards other fish with similar fins, but plecos typically stay on the bottom and are less likely to provoke a betta. It's essential to ensure that the tank has plenty of hiding spots and territories for both fish to minimize stress and aggression. Always monitor their behavior closely when introducing them to the same tank.