Thanks, I'll keep an eye out. I'm surprised that my bag of wheat bran sat on my kitchen floor for a year with it's top pinched closed only and no signs of mites or anything.I need to mention that wheat mill run has a tendency to promote grain mites, even after being heat treated. I have the critters on a walk-about right now under my living rooms shelves where the mealies are housed.
I had oven treated the substrate for 45 minutes at 275F, but that wasn't adequate. At 300F, it begins to scorch, but I suppose I need to do it anyway.
Moths in my bins, a whole other story! And to top that off, learning that rats are problem as well if I store it in my pump house or barn.
Oh, and I quit using melon as moisture. I have a few black ants trying to find something to eat in my bins now, and I KNOW ants will eat many other things (bugs), so I'm a little worried about maybe some pupa, or really I guess anybody in there. Oh, and in my pump house, I also found earwigs trying to move into my bins! Who knew?
ETA: the ants appear to be more disoriented than anything. Maybe looking for moisture during this dry season. They don't go after watermelon stuff still sitting on my counter, so that may be more coincidence than anything.