to answer some of your questions, a adult ball won't do in a 20 gal, 40 gal breeder yes, the bite is equal to a bee sting, if not less, my kid's bite is worse, most balls are freakishly tame, mine has been a sweetheart since it was a baby, never even tried or thought to strike at anyone, balls stress when the husbandry isn't right, they like nice and tight hides, one on the hot and cool sides, temps should be 90-92 for the hot side, 80-82 on the cool side, anything below 75 is dangerous, my bp usually takes a dump every week before his feed, like clockwork, can't help ya with the mite question, never had em, balls generally get big girth compared to length, biggest i've seen was a 6 foot breeder female, she was like 2600 grams, the weight of an adult can differ greatly, they are all different.