This is a most common and most fatal betta disease. Look at the picture above, bloated stomach is a indication of Dropsy Very little is know about it, but what causes the raised scales is fluid building up under the skin, inside the betta’s tissue. Usually what causes fluid to build up is simple kidney failure. And as you know, once the kidneys fail, stomach bloats and betta dies. Although dropsy (the symptom) itself is not contagious, bacteria that causes this disease may be contagious.
Bettas with Dropsy has the following symptoms
-Raised scales around stomach
No known cure. Keep water clean, keep him AWAY from any other bettas