Some nuts have mold on them and that's certainly not good for your candida, they are also fairly difficult to digest, and undigested food sitting in your digestive system is NOT what you need when you are suffering from a candida infestation.
Realistically you need to test the foods including avocados, and see how your body reacts. If you find that you can eat a whole avocado with no side effects at all, then why not? But with all foods increase it slowly.