Okay so I live in Las Vegas, and I easily have access to 4 Petsmart, 4 Petco, and 1 Tropical Fish store around town that I travel by daily, and I enjoy Petco's bettas more because they actually have Delta, Dragon, King, HM's, etc. However when I go in there and look at them, I don't know if I am picking a full fledged healthy one. I always look at coloration, bubble nests?, flaring, responsiveness, but as far as the physical health of it I am kind of confused.
I see some labeled half moon, but have fairly short tails and they aren't as full as some of their others, but may have great coloring. Will these ones ever fill out like them? Should I even buy from a petco/petsmart? My tropical fish store usually has the best bettas as far as beauty, but its a mad dash rush to get in and grab fish from the minute their new supply truck comes up. (No joke.)