I do not measure the Harrisons. I just put in about 10 or 15 cubes and call it good. My Grey wastes 90%, as you describe.
I also give him a seed mix by Kaytee called Fiesta blend. They need protein and if they are not eating the pellets well, they need some seeds and nuts, especially when molting. Greys need around 18 to 20 % protein from their diet daily.
The veggies provide the vitamins they need.


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