Most vets don't even understand a glider's nutritional needs.
A pelleted diet is not good for them for many reasons. THAT particular diet is not nutritionally balanced enough to maintain a healthy glider for very long, and I assume you want your gliders to live long, healthy lives.
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Additionally, there is a very large risk of afalotoxin poisoning when using a pelleted diet. Not a risk I would ever put upon my gliders. Too many gliders have died from afalotoxin poisoning, and now that we understand it better, I don't know why anyone would feed that diet - except that it seems easy. Try HPW, PML, Priscilla Price's diet or even BML - your gliders will be much better off for it.