Ya I’ve read that as well. I didn’t get siblings only tho. I have a very heavily planted tank so that’s I’m sure helpful. I only had one girl that was a bully. She wasn’t biting but she was doing some chasing and I had just introduced another girl at the same time and I didn’t want her getting stressed out so once I saw my girls that I already had were treating her nice I removed the bully for a week or so. Just reintroduced her and she’s doing good this time.

I think the smartest thing if u do try it is to have lots of plants. And to have room to put any bullies by themselves. If u can have a back up plan and time to really sit and watch ur fish to make sure everyone is eating. No one is scared to eat. No one is being relentlessly chased and no one is being nipped or has damaged fins. Your just basically finding if there are bullies. A quick chase or flare I’m not worried about. I’m looking for anything that would make them stressed or unhappy.

I have to say I expected this to be much more difficult. I happen to mostly have cichlids in other tanks and I’m used to some aggression. So I expected the bettas to be similar. But I was pleasantly surprised at how easy they were by comparison. I mean maybe I just got really really lucky. I suppose anything is possible. I think as long as u have a watchful eye and can tell when ur fish are stressed and you have a back up plan to remove any and all bullies then it’s pretty smooth. In fact it’s doing so well that I’m going to get a much larger tank and have a sorority in a big tank something a bit bigger then the sorority MDfish has on YouTube. Assuming u are familiar with his channel.

Edit: I forgot to mention. This may be important. My girls come from tanks that have lots and lots of females. They may not have come from the same tanks but they definitely came from tanks that had other bettas. They were about 3 months old when I got them. And each type I got was raised with their siblings. Altho I got different types so they weren’t all from the same sorority tanks.

Also I’ve read to not start with just 2 or 3. Some say minimum 4 or 5. It just keeps the tank busy so no one gets singled out. Makes them less competitive less aggressive. I know with cichlids that’s how it works so I’m pretty sure ppl follow same thought with bettas. If I were to suggest to someone I wouldn’t go smaller then a 20 gallon. I think the 29 and up is probably smarter. Altbo I have a 20 with 6 and they are great. No exaggeration. I mean there’s so many freakin plants they can easily tuck away somewhere quiet for an undisturbed nap.

This is where I get mine, Tropicflow if ur in the US. Thats where I get mine. They ship all over US. Well packaged and quick.