No female male will kill her or visversa endless would be ok
Also how tall is the tank? Not too tall I hope male Bettas are useless at climbing very tall tanks to breath
The water line reaches 35cm high. Also why will the male kill a female, how do they breed?
they are very terretorial fish anyway and males and females can rarely be kept together. you CAN keep a group of females together but your tank is slightly too small for that
I have two male dwarf gouramis could i move one with a male?
if you do then they will probably fight, but i have a gourami in with my 4 females and 1 male. they are terretorial so what you will have to do is reareange the plants and everything in the tank and then put them all in at once, then you will have to watch them for a few hours to see if they try and kill eachother and if they try then remove them, thats what i did