I don't like keeping it in the fridge for more than a couple days. It doesn't seem to last and the geckos don't seem to like it much.
I've had great success however with freezing it. I get disposeable 1/2oz cups and lids for said cups and portion out some food into those, place them on a cookie sheet, then freeze. Then I store them in ziplock freezer bags. I have quite a few geckos to feed so this really expedites things time-wise.
Some people have different opinions on whether or not freezing is okay for the food. I have had NO ill effects, my geckos eat it just fine (actually they seem to prefer it as after freezing it's a bit thicker and they chow it down easier) and I have had no health issues in my small colony. I have read on the Repashy forums that others have done this with both crested and day geckos and no ill effects had come even after years of doing so...
It might be a solution.
Otherwise, you might want to weigh out a teaspoon of each to get an idea of weights. Then simply take note of the ratio and work from there.
(I don't know if any of this is covered in that video. I didn't watch it...)