Cliff what part of TX are you in? If your close by we should hit up the Dallas World Aquarium or something if you've got time.
Back on topic, mine RTC x Marble came in better then most did on the first order and was doing fine, eating out of my hand on frozen blood worms immediately. Was fine for about a week then I come in to find it KO'ed for no reason. I did notice some smaller red leisions on the belly area but water paremeters were perfect in my tank as well. I still think its just random sudden death in pimeloid catfish and unavoidable. ~Trent