if you like him, i'd go for him!!!! i think all crown tails are a little more prone to bloating then other bettas, their bodies are so skinny and streamlined. You're probably already doing this, but it might help to feed him very small amounts of food, and feeding in the morning/early afternoon is best because their digestive systems slow down at night. I'm sorry that your female isn't doing well, that's always so sad =(
My Current bettas:
Sullivan- Orange rose tail halfmoon male
Daisy- Mustard Gas (black and yellow) veil tail female
Milton- Teal butterfly halfmoon male (mom's betta)
DFTBA to nerdfighters working to decrease world suck!