Yesterday I was strolling though petco and they got in a shipment of the king bettas. I've been wanting one . So I picked one out then "hid" him since I had my dog and daughter in tow. I came home set up my 10 gal
with heater/filter. Sand substrate. A couple homemade slate structures, fake plant and floating plant. I put some filter material from my already established tank.
I waited a few hours. Went and bought him. Waited a few more hours then started floating his cup in the tank. Got him in there and he did great overnight. He's been very adventurous.