Hi everyone, I've spent weeks searching for the perfect substrate for our indoor parrot enclosure. It contains nine budgerigars and a red-fronted kākāriki. Most of our birds were rescued from cases of neglect. Most of the birds are immune compromised (cancer, neurological and psychological disorders, prolonged malnutrition), so the substrate needs to be fairly resistant to mold and bacteria. One of the budgies is unable to fly due to neurological problems, so the bedding would have to be somewhat soft to prevent injuries from falls. The kākāriki, on the other hand, suffered from years of severe emaciation, malnutrition, muscle atrophy, and various untreated infections. His lungs and air sacs are filled with scar tissue, and as such he has difficulty breathing. Unfortunately, he has a granuloma which can't be removed, and as such he is constantly battling bacterial infections. Furthermore, his legs are extremely weak, and they constantly splay as he walks. In the past we used shavings, and while it did help to provide him with better traction, his legs would splay to the side when the shavings slipped. He actually has callouses on his "ankles" from walking on them so much. He was actually unable to walk in an upright position until a month ago, despite being under our care for over a year. Additionally, I'd like the substrate to be good for foraging in. As part of their daily enrichment seed and insect larvae are scattered on the floor of their enclosure to promote natural foraging behaviours. Anyways, I appreciate your help in choosing substrate. I'm not a part of any zoo association as I'm a private guardian, so I don't have access to the same resources as many of you do.