You need to feed them meat in morning, even dog food... You need to grow comfrey for vitamin Bs, and you need to get some carob beans3 pods to 2 gallons, and 1 cap apple cider vinegar per gallon then brew for a week somewhere cool and dry, substitute it for their water in a week after doing all...
It's probably a lack of protein start by feeding them meat in the morning they love tuna even dog food, you need to grow comfrey for vitamin Bs to help with stress be warned though they'll destroy it if they can get to it... You also need to get ahold of carob in bean form and add 3 pods to 2...
Males gotta prove he's good sort in order for the female to submit you'll know if she's happy with him as shell lay for him to mate it's standard in the animal kingdom where the male is smaller... Gotta prove himself the female will test him until she's sure or reject him much like bonding but...