Mebbid summed it up perfectly.
And quite honestly Ninjanomad, you really don't know anything. You want to do a betta sorority in a 10 gallon with adfs AND a gourami. AND you think 20L means 20 liter
. And you don't even know that 2 bettas will kill eachother, female or not, in a 10 gallon. But we didn't react like ^^^ that at first. We tryed to be nice. And then you were wrong again. Then you started correcting people when they were not wrong. Then you got defensive. Then you called US jerks. Good luck joining another forum, there aren't many better than this one, and I doubt any others would let you be a member if they knew what you have been saying here.