Colin Walker is the man, He advices to treat ; week 1 worms week 2 cancker week 3 cocci, On a four week cycle. However there is a new wormer from Chevita that will treat all three. Colin would advise to treat these three and nothing else. Chevita's ascapilla. is available from body & ridewood on line at www.everythingforpets.com. Rather than buy more birds buy his book you will keep 'em healthy then