I use the concrete perches or calcium perche's. I personally don't like the sand perches. I used to have one and my birds feet got roughed up.
https://www.amazon.com/Penn-Plax-Ce...s&qid=1575575846&sprefix=concrete+per&sr=8-16
https://www.amazon.com/Penn-Plax-Ce...s&qid=1575575846&sprefix=concrete+per&sr=8-16