What is the soil mix that you found here on the forum? I have seen a number of soil mixes recommended on this forum that unfortunately were not safe. Unless @Tom recommended it specifically, I would be cautious. I think it is far better to grow your Tortoise food outside of your enclosure. It is often too warm in a closed chamber to successfully grow crops anyway. Also, it should not be necessary to use a fogger of any type in a properly set up closed chamber. I'm so glad everything is checking out, that way you will be assured of raising up your own babies successfully next time. Again, I am so very sorry this has happened to you yet again.Back years ago I bought my babies and I had them in an open type tortoise table, I also bought the sulcata from a local backyard breeder who told me they are Desert tortoises and that they don’t even need a water source. The leopard I got years ago was also not started well and I didn’t have the proper set up, the uv bulb was wrong for both enclosures and so was the heat lamp, and again I believe it was a bad source, the leopard never grew or wasn’t very active from the start. I was stubborn and didn’t believe the forum members until it was too late... although I did try, back then things might have been different if I had a proper set up from the start. I believe that 6 years ago it was 50-50 of fault of my babies passing.
This time, I really did everything the way I was supposed to. I listened to everything anyone suggested, I thought it was a good source for tortoises. But both now and then I have used zoo med coco Core, I cannot remember the source of the seeds from years ago but this time the seeds where specifically for growing for tortoises. They have no additives to the seeds and I found the soil mix here on the forum. I have not found any signs of mold, mildew or fungus and at this point I took out most of the stuff inside my newly empty enclosures. I checked everything probably 100 times. I found my source of the babies on here this time, although I have recently found out that the breeders they acquire their tortoises from raise their hatchlings the “old” way. The water source now is deep well water, and we had it tested a year ago, it’s not contaminated, no chlorine or chemicals.