Hi Paul, a few years back I use to visit a a good friend of mine called Raymond Imgrham (only 3 mile away),a good pigeon man but better with the microscope.He had a cracking set up aswell as the coffe and biscuits,he done swabs, cultures and dropping tests etc.His opinion on hexamita was to use a liquid canker treatment rather than tablets.Gary Spavin took his business over when Raymond moved down Country.A big loss to the bird men around here because he done all types of birds.
Lindsay