Enkil I always said that naturally look tanks with live plants are better than this with plastic. They're looks better and fish in them feels better :) And real plants are very useful, they create a better case for live for water animals ;) Real plants have many qualities.
Nice tanks! :) Keeping males with females isn't usually reccomended as usually one will get picked on. It is OK to keep females in groups of 5+ in 40L+ tank. There is a few rare occasions in which males and females are kept without fighting, but it's very rare.
Yes, I know about that. I don't have bettas from yesterday ;)
For betta harem (1m+2/3f) is reccomended 45L+ with many live plants and places for hiding. If fish have space for running before aggressor there is no fighting usually.
I know that betta females are very changeable but I'm ready for this.
For right now everything is okay ;) So don't worry be happy :D