My inmate is in solitary and has anxiety issues, is there anything we can do to get him transferred?

There is very little you can do about the housing situation of an inmate. The designation is decided and approved by the administration and they internally document their reasons for every decision. These decisions are not available to the public. Once an offender is the property of the state, there is nothing an outside influence can change. He may petition his case manager for a transfer but the status of SHU is not available for appeal. If he has been locked up a couple of times in the past he should use his experience to stop committing acts that send him back. They have him in lock-down for a reason and if violent outbursts are his nature, they will keep him there a lot longer than 30 days.