beautiful pics bettaman.
i can attest to the fact that winter spawns take longer to mature. i am a big believer in the benefits of sunlight and bettas and up here in canada, we don't get a whole amount of sun in the winter. my last 2 spawns from before christmas are both slow growing as opposed to my summer spawn which was fast growing in comparison. genes have a little to do with it too, inbreeding too many generations causes slow growth, as does breeding a pair too soon after a failed mating attempt. always better too give them enough time before spawning again.