the black spots vary in size, mostly they are the size of a pencil dot up to 1 quarter inch by 1 sixteenth inch. i suspect the fish were on hormones because of their bright colors, even on small fish at 2 inches. the fish with most of the spots is a 3 to 4 inch female. i noticed 2 more fish with a single spot, pencil dot size. the fish appear vigerous and healthy. no clamped fins. i will try the methylene blue and more salt.. thanks