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I will take some of this and turn it over to someone else.
Is there anything I should watch out for with the mineral supplements?
Make sure they aren't expired.
Is there a "Gutloading for dummies" tutorial?
I can only tell you what I do.
Cheap cat food.
In a blender add the cat food, doesn't matter how much.
Add 10% powdered milk by volume.
Add 1% vitamin supplement by volume.
Blend this all together until it is the consistency of sand.
Feed to your crickets.