Agree to the health issues...all large bettas I've had from WalMart and PetCo have gotten dropsy. And compared to real giants...they're like baby guppies compared to a shark ;) Bigger yes...giants...definitely not.
Can we please get a sticky on this topic? Everytime I'm on someone is asking this question.
Who am I? Well I am a Junior Member of the International Betta Congress and a breeder of white HMPKs, red dragon HMPKs, black/red dragon HMPKs, metallic multi HMPKs, blue masked HMPKs, and now multi color HMs. Soon to add black HMs. I will be showing in New Breeder class in fall of 2012.