Picked up a new rack at the show this weekend and it absolutely rocks! Huge shoutout to the manufacturer CSerptents. There were 3 other guys selling PVC racks there and his were not the cheapest but they were by FAR the best. And yes, I have three open slots. Already have a good idea of what im going to put in them, just need to save up a bit. Tubs are vision 70's which beat the crap out of any Rubbermaid or Sterlite tubs you can find. Heat is 4 inch flexwatt controlled by a herpstat 1. Holds an excellent thermal gradient, actually way better then I was expecting.