I have similar experience with neon tetra, my 1st time actually keeping them personally. Mix was 2 male and 3 female in very well planted 7gal, 16x9x9 bow front. The male to male harassment was relentless, the dominant males harassment of females just barely less forward, but it was spread between 3 females. On other end the Ember tetra (6 of them, 2male, 4 female), nothing but peace and calm, even the neons got in on calm swimming/shoaling up front with them.
Actually it was interesting looking at habits and interactions between species, but especially watching how ea. species interacted as a whole, but within that community. Betta big enough that Rotala Rot. blocks his path to half the tank. Small fish just ducí away in between plants, betta canít follow them. Gets tired pretty quickly.
Betta quickly learns that casing fish into weeds is a waste of energy, wonít bother. At this point is where you gain upper hand. Small fish unite and form a shoal, betta learns to ignore them, he finds his extra food at feeding ring, a calm pattern settles over tank. The smaller fish circle like sharks below feeding ring, there is always extra droppings from ring as betta eats. But no food hits substrate.