I use the Harrisons adult lifetime superfine, but I think you're supposed to feed the high potency for 6 months or something first. I don't know... it probably says somewhere. It is kinda pricey, that's why I'm also going to start feeding Rhoudybush with it. That and also because it's always out of stock where I buy it.You said that you used Harrisons brand right? I looked that up yesterday it was pretty expensive, but that is to be expected with a high-quality brand. I couldn't find which one of their products was specifically for budgies. Which product do you use?