I breed dwarf white isopods for my dart frogs. They are very small with the adults maybe only 1/3" in length. Haven't actually tried them with my chams since they're so small. Easy to breed, but not sure if anything larger than a baby would eat them. I know in the US you can get giant orange isopods from some dart frog suppliers. You might want to try those as I understand isopods are a great source of calcium.