I wouldn't switch her until she is about 1500 grams, a 29 gallon can hold lots of branches and hides, you can view my gallery to see some of my set ups. I have 10,20 long, and 30 gallon critter cages. The only difference between 40 gallon and 30 gallon critter cages is the height. Since all of my tanks are on metal racks, shorter is better for me.