Kings aren't giants BTW they're just big. Real giants can get up to 7 inches in length. I've seen a pic with one in a tank with a 3 inch female (who is really big for a betta anyway) and she could probably fit in his mouth!
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.