Get that walnut stuff out ASAP. Not recommended for any reptiles; it can cause impaction and gets moldy easily. Don't ask me why they sell it! I don't keep redfoots, but I believe cypress mulch is often used.
HTH,
Sohni
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Sohni
2.2.2 Testudo horsfieldii
0.0.2 Testudo hermannii hoetgeri
0.0.2 Testudo hermannii hermannii
1.0.0 Testudo marginata

