Velvet or some similar external parasite, which is a
single-celled, 3 stage life cycle organizm that will proliforate to unholy
levels in any closed system. The best remedy now available for this is
Aquaruim Products' "Life Bearer" . .. If your aquarium store does not have
this, you could try CLOUT, which is carried by almost all stores. If you do
not medicate immediately with something that will kill the parasite, you
will lose them all. It would also be a good idea to do a complete water
change before medication. You might want to put the fish in smaller
containers to medicate.

by linda, USA transhipper.

thanks for pinning that Yeevs. We needed that. maybe other mods could pin other articles on betta disease and treatment