You can just edit your original post.
Anyways, Marine Bettas can be difficult to keep. Most people do not recommend keeping them, as many die in captivity.
They're nocturnal and prefer not to be in bright lighting. If you have a healthy anemone, you have bright lighting, so unless you have numerous overhangs and caves for the betta, I don't recommend one for your tank.
If you have a hosting pair of clowns and they show aggression, you may have aggression issues with ANY new fish that you attempt to add.
Also keep in mind that Betta's will eat smaller fish.