I started a betta sorority today. I have 7 in total. I have had one for ages and added 2 yesterday and no problems with them then another 4 today. All are fine except two who are flaring at eachother and not backing down. They then started fighting. I put my hand in and broke it up and they are away from eachother now. The two fighting are two of the four I added today.
What should I do if they start again? The others are all ok and just turn away if they get flared at by one of the two. They're staying away from eachother now since I broke the fight up but advice just in case it starts again would be appreciated.
The tank is heavily planted and decorated with a cave and log to hide in. Fully cycled. 15 gall