I am not saying that you are wrong but could you tell us how big your tank is and how long the betta and all of them have been together? While this is not an impossible situation, all the semi-aggressives that you have listed there are an unusual combination and it would be very unusual for the combination to last a long period of time without territorial issues coming into the mix. When that happens there will be problems unless you have a gigantic tank with a LOT of room and places for hiding and heavily planted areas for fish to get away from each other. It would take a lot of skill and much aquascaping to keep all those fish happy and alive. It is not an impossibility but not a mix made for a beginner in the hobby or someone who is not willing to spend a lot of time and money to keep their fish safe.

I have seen semi-aggressive tanks that have worked but they are massive like in the 125 gallon category at a minimum and heavily aquascaped and not heavily populated with fish. It just depends on what you want. But know the natures of your fish and give them their space if you insist on combining fish that you know are territorial by their very nature.

Thank you for your post. Could you consider posting pictures of your tank?

Rose