LOL, Malatov! I tried to keep all my names short & descriptive so I could remember them.
"Unpredictable" is the key trait w/ bettas, I'm discovering. I think that's why we love them. Other fish school together & follow the leader, but bettas all have their own ideas about how the tank should work. The meekest fish can turn into a little terror overnight. I think I posted before that I make use of "timeout" tanks. Whenever I'm in Walmart, I pick up one of those tiny $3.99 acrylic divided betta tanks. They fit in the top of the larger tanks so the offending fish can float there and be humiliated. I will dump the fish back in occasionally (and at feeding time) until she's learned her lesson. It works, but I make sure she's really causing damage. Everyone gets to bully a little bit; when it goes to their head, it's "timeout"!
P. S. those tanks are very handy; it's worth having a few on hand. You can use jars, but the rectangular shape, divider and cap make them great for working with fish. Rather than spending $40 for 10 all at once, I toss one in my cart whenever I'm buying my cat's Fancy Feast! I have also made a habit of buying extra nets: the small ones. Each tank needs an "emergency net" handy, b/c you never know when one betta drama queen will make a leap for it and winds up on the carpet!!!
4 bettas: Butch, 3-year-old violet male PK EE & 3 girls in a 30 gal sorority. I do not name the girls anymore! 1/2 of them die within a month.
30 gal: 9 Oto cats, 4 Ocellifer cats. Inverts: Cherry shrimp & 2 assasin snails.
10 gal.: Butch, his 5 oto cats, 3 assasin snails, and a few snails the assassins haven't caught.