I am a fan of the Animal Plastics racks for smaller collections. The Economy Plastics line is really good, and like Zeus said, it will hold two sized tubs. Those work really well for pretty much anything (except hatchlings, the 15qt tubs are to big), but the 32qt tubs will work for adult males just fine, and will hold a female up to like 2000 grams. After that, you might want to get a larger rack that fits cb-70, or the 41qt tubs. Another good thing about animal plastics is the price. For a small breeder, the price is right, but you will need to order well ahead of time, it takes a few weeks to get it to your house. Hope this helps.