I have one betta fish in a 10 gallon tank. He's lived there for about 5 months. I wanted to get him some tank mates, so today I bought a snail and two oto catfish. I added them to the tank about an hour ago.
The betta is totally okay with the snail. It blends in with the rocks in the tank. One of the oto catfish is hiding somewhere (I hope; I can't see it). The other oto is more active, and my betta is stalking it and chasing it occasionally. The betta lunged toward it once. I can't tell if he's just very curiously stalking or if he's being aggressive. He's not flaring.
At one point should I be worried? Should I remove the oto fish?