I've been thinking about adding some new fish to my tank and I've heard
many different things about putting other fish in with male bettas.
Right now, I have two male bettas split up in a 10 gallon tank. I've
heard that I cannot possibly add any other species at all to the tank
due to some sort of toxin (?) the betta releases that can harm other
fish. I've also heard that that is BS. I'm assuming that I should not
add any species that possibly looks like another male betta, and I
understand bettas are pretty peaceful when it comes to other species
right? So what kind of mellow, freshwater fish could I add to the
tank, if any? Thanks for your help!