Originally Posted by Ajones108
Interesting. I learned something new today. :D Might stock 8 of them in my dad's 28 gallon then.
Yeah, schooling fish like danios and tetras actually interact really roughly with each other if you watch them. They're constantly bossing each other around, so having more fish will help distribute the aggression, like in a sorority, so the same tetra doesn't get beat up on. When they're in smaller numbers, they feel insecure and try to find more fish to join their school for protection. With all their rough-housing, no betta would enjoy becoming an honorary tetra! In the wild they live in schools of thousands, so it's no wonder that they're stressed out when you only add 3-4. The more individuals you can manage, the better.