oh wow thats awesome..especially for those who want to do it but may not exactly be able to afford it.. :)
i too think even though it is 1 of a different color..it has a dominant blue gene trait in it that carries that disease..since its all over the world.can rule out it being from a certain source and has to be most likely a gene problem..could have laid dormant for a while.and new conditions have woken it up..climate change.water conditions.or whats in the waters itself since water is treated and not rain water sitting on the ground..there are so many different variables that could cause it.could even be plants.as well as the oil on human hands when we clean out our tanks.
if i had the gear.id do my own research..look for maps of a healthy betta gene and see if i can find any patterns that may differ from the sick ones provided i can see a sick 1 or any difference in gene with the ones i now have if possible to extract DNA samples without harming mine.though i could go to LPS and find dead ones as i have recently