If it's the exotic nutrition hpw I would switch, their food is crap.
Diet is one of the most confusing and stressful topics, everyone has an opinion, and many disagree with it lol.
There are 2 diets I recommend, critter love hpw https://www.critterlove.com/food-sides
and bml http://www.bmldiet.com/index.html
Both have been tested, used long term, affordable, and take the guess work out of all of it.
If you feed either of these and follow the directions, you don't have to worry about the ratio, that has already been done for you and calculated into the recipe.
Understanding the ratio seems more complicated than it is, this is a very stripped down basic explanation.
0:0 represents calcium to phosphorous. So 2:1 means 2 (calcium )to 1 (phosphorous).
The numbers will change with each food but always the first number is calcium whether it's higher or lower than the 2nd number phosphorous.
The second number is always phosphorous whether its higher or lower than the first number calcium.
So if the ratio looks like 12:3 that food is very high in calcium and low in phosphorous.
If it looks like 3:12 It is very low in calcium and high in phosphorous.
You can pair a food high in calcium with a food high in phos to balance it out closer to the 2:1 ratio that's where it gets more complicated especially if math isn't your strong suite like me
Foods higher in phosphorous inhibit calcium absorption in the body. So the 3:12 food high in phos makes it harder to absorb what little calcium it provided if any at all. Which is why people try to attain the magical 2:1 ratio.
The ratio isn't the only thing that affects how the body absorbs calcium and or other vitamins and minerals. For example High oxalate foods ( most dark leafy greens ) can also contribute to slow or limited calcium absorption, high in
vit c foods can improve and optimize the absorption of iron, which is hard on the internal organs.
One major difference in the 2 diets above is One (critter love ) you have to order online and the other (bml) you can find all the ingredients locally. Doesn't seem like a big deal, but if you don't have a credit card it's harder to buy online, though I'm sure temporary cc would work or paypal.
Pellets, a lot of people use good quality pellets from Petpro. It is a another controversial topic lol Personally I don't use them nor do I like them and neither do my gliders.
I don't like them because I feel there is to much of a risk for aflatoxins when they aren't stored properly, and I don't have enough freezer space to store them properly.
However, when stored properly and fed in addition to a well known diet I think they are ok and it's a personal choice.
Calcium powder to put over the food. No. Sprinkling calcium or multivitamins isn't advised. There is no way to know if you are giving to much or to little to much can be just as bad as not enough.
If you feed on of the diets above the calcium is already in the diet in a measured amount distributed evenly throughout the staple. There is no need for anything to be added to it or sprinkled on top.