Thank you so much for your reply! The humidity is so high and I actually plan to drill more holes in the tub and the temperature is 80F low and around 87F high. He didin't soak this morning but I checked another ball python he got dark spots at his chin and back, I rub it with reptile spray on my hand and paper towel and they don't move or fall, like they're two-dimensional not three dimensional. He never soak I hope I'm too sensitiveAnd may I know that how does the vet check the mites? Did the use some special tech or just watch it carefully?