One of the keys to keeping your birds healthy is regular cleaning of their aviary, cages, play stands, and accessories. Use hot soapy water and rinse thoroughly. Use a safe disinfectant e.g. F10 to eliminate bacteria and viruses.
Vitamin and mineral supplements will contribute to wellness. Antibiotics are available should you have a sick bird and probiotics should be given after a course of antibiotics. It is however advisable to keep the contact details of  a vet specializing in birds handy.