Wow thank you for the objective and thorough answer. Ninja was placed back in his home tank but I sort of get the feeling he rather enjoyed himself exploring the 120 with the placid residence. Assassin is staying inside large breeder for mow until I can install a 10 unit, 10 gallon Betta condo inside the back of a 180 used acrylic tank and cabinet I'm supposed to pick up for $200.
So the betta's aside what else do you see that I have specifically that may have aggressive issue? The only other issues I have had is with the Barbs on barbs but they never seem to do fatal injury only superficial and then its over and the injured becomes submissive and then accepted again. Or do you mean just with respect to Betta interactions with other fish? This of course is my last two Bettas until as I mentioned I install a permanganate separator for viewing and easy access inside an existing tank.
When it comes to assessments I have always taught and been taught in the Coast Guard to accept objective criticism because that is how we learn. Its when answers or questions become accusational (if that's a word lol) that I must retort. But I have learned its best not to answer and move on to the next objective comment lol. Again thanks..