Before you get your new glider, I would get the surviving one vet checked, n fecals done. If it's something contagious your putting the new one at risk of getting it. Then you will be getting into a cycle of losing one then replacing it if something is wrong.
Im not a huge fan of the tpg,personally. Variety isn't necessarily a good thing when it comes to glider diets. I used to think it was but really if your changing fruits n veg all the time and offering different things the diet really isn't that consistent.
I also don't like that the vitamins/mineral supplement is a sprinkle on top each portion and not evenly distributed throughout the staple. Gliders can and do eat around it. If the gliders don't ingest it, it isn't doing them any good, and without them the diet is seriously unbalanced and lacking.
There is NO way to tell if the ingredients are human grade because Priscilla refuses to make the entire list of ingredients public. Another thing I don't like about it, I know what is in it for the most part, but the most part is not enough for me to decide if I want to feed it or not.
Bml uses the reptile calcium and multivitamin because it is the only ones designed for animals in comparable weight and body size to a glider. Human grade is not always a good thing either, human grade also means it's calculated for human consumption ....quite a difference in size, weight, metabolism etc. to a under 200 gram animal.
I tried feeding variety, and always came back to the fruits n veg listed for bml as my gliders preferred fruits n veg, they eat them the best and most consistently. Which also makes me feel very confident they are getting a consistently balanced diet.
I also bought the myth and rumors some gliders don't eat it well because it's gritty... if the recipe is made properly, and blended in a blender or food processor it is not gritty. It does however smell awful, that is true
The choice, is of course yours to make, those are merely my reasons, and what I have learned to help me make my choice.