I bought a couple of hundred dermestids to start colony about two months ago. All seemed to be going well, and they were breeding, then in the last week I have noticed a drop in activity. Some of the larvae seemed a bit sluggish, but when I checked them with a hand lens I couldn't see any mites. They are housed indoors, in a large tub with a mesh top so they have good ventilation. The substrate is paper towels (kept dry), and they have egg box and styrofoam to hide and pupate in. I feed them every couple of days on defrosted chunks of pheasant. Today I noticed some orange colour on the edge of the tape that I put around the mesh on the lid. The hand lens came out again, and to my horror the orange is actually lots of little round things, presumably mites. Then I found an adult beetle with some mites on its underside. I've not found any on the larvae yet (but maybe they're just too small to see, even with the lens?). Is there anything I can do to save my colony? I have heard of people usingCheckmite, but it's not available in the UK . Does anyone in the UK have any experience with using any mite treatment strips that they could recommend? Would removing and destroying the bedding make any difference? I've even thought about checking all the beetles and separating the ones with mites. Luckily it's not a large colony, so it would potentially be possible (though time-consuming), but I'm not sure it would be effective anyway as surely there are mite eggs/larvae everywhere. If anyone has had any success please let me know!