DO NOT USE SMOOTH PERCHES THEY WILL CAUSE BUMBLE FOOT USE NATURAL PERCHES SO THEIR FEET GET EXERCISE> another thing that you can do is you can wrap the smooth perch with avian medical tape.You should also always have flat perch so their feet can rest. Try using rope perches, natural perches, and flat perches. You should also always have one perch outside of the cage so they can fly to it whenever they want.Java wood perches are the best!