So I have a fully cycled 10 gallon tank that has fake silk plants with 2 cobra endlers guppies. One of them is a mix with a fancy guppy but he still looks like a normal endler other than being a little bigger. I also have a blue male betta. He gets along fine with the endlers but will flare at them occasionally. I want to know if I can add any female bettas and if yes, how many? Also I want to get maybe 1 or 2 more endlers. Would that be ok?