It's on his chestI agree. You don't want to fool around with sores on the foot.
Those java wood kind of perchesWhat kind of perches are in the cage? Are they perhaps too slick (round dowels for instance)?
Those java wood kind of perches
Depending on the specific wood and thickness, java wood can be really slick. You could try to wrap parts of it with vet wrap to provide extra grip.
I give them a mix. Beaphar big parakeet food mix and small parakeet mix. Then here in the netherlands we sell this egg mix, suppose to give them all the vitamines for egg laying. That's the biggest part of their dry feed. And then i add dried quinoa, chia and a little bit of pumpkin en wallnut every day.What diet is your bird on? Certain vitamin deficiencies can manifest as poor balance and poor grip.