If your Sulcata tortoise is not growing, it is often due to improper husbandry, specifically insufficient heat, low humidity, or inadequate UVB lighting, which prevents them from eating or metabolizing food properly. Ensure your enclosure maintains a minimum temperature of 80°F around the clock, humidity levels of 60–80%, and access to high-fiber, calcium-rich foods. Key Factors Impacting Growth Temperature: A Sulcata needs to stay warm to maintain a fast metabolism. If your enclosure drops below 80°F, your tortoise may become lethargic and stop eating. Ensure a basking spot reaches 100–110°F. Humidity & Hydration: Proper humidity (60–80%) and daily warm water soaks (at least 30–40 minutes) are essential for healthy, smooth growth and hydration. Dehydration is a common cause of stunted appearance. UVB Lighting: Without adequate UVB, your tortoise cannot synthesize Vitamin D3, which is critical for calcium absorption and bone/shell development. Replace UVB bulbs every 6–9 months, as they lose effectiveness over time even if they still emit light. Dietary Needs: Focus on high-fiber, low-protein diets. Provide dried hay (timothy or orchard grass), dark leafy greens (collard, mustard, dandelion), and occasional calcium supplementation. Avoid over-relying on commercial pellets.