Tortoise pyramiding shell: UV and basking fix

Pyramiding is a strong signal that something in the husbandry hasn't been quite right — and your vet is spot on to point at UV exposure and basking duration first. Getting heating and UVB lighting right is genuinely the single most important factor in tortoise health: metabolic bone disease, shell deformities, and immune problems are almost always rooted in incorrect lighting or temperature gradients. To give you the right advice, can you tell me: what species of tortoise, what size is the enclosure, and what lighting and heating are you currently running?

That compact UVB bulb is almost certainly the core problem. Compact 10% bulbs produce a very narrow, weak UV beam — a Hermann's tortoise needs a UV index of around 3–4 across most of the basking zone, and a compact simply can't deliver that over a 120cm table. The short basking time is likely a consequence too: if the UV and heat aren't quite right, tortoises often avoid basking because it doesn't feel beneficial to them. What's your current basking spot temperature, and where is the compact bulb positioned relative to the basking area?

Two issues there. First, 28–30°C is on the low side for a Hermann's — you want 35–38°C directly under the basking spot, with a cool end around 20–22°C. Second, a side-mounted compact at 20cm is giving almost no usable UVB — tortoises need overhead UV to mimic natural sunlight, and the angle from the side means most of it is wasted. I'd recommend switching to the Arcadia T5 UVB 12% Kit for Tortoises, specifically the 54W 1.2m version. It mounts overhead across the full length of the table, produces a wide consistent UV zone at the correct UVI, and Arcadia's 12% tube is the most widely vet-recommended option for Mediterranean tortoises with known UV deficiency. Pair it with a 75W or 100W halogen basking bulb to bring that spot temperature up properly.

The existing pyramiding on the scutes won't smooth out — keratin and bone growth that's already happened is permanent. But with correct UV and basking conditions, new growth coming in at the edges of each scute should be flat and healthy. In a well-managed adult Hermann's you'll typically start to see noticeably smoother new growth within 6–12 months. The other thing to check alongside lighting is hydration — regular lukewarm soaks three times a week help enormously, as dehydration is a secondary driver of pyramiding that often gets overlooked.

Very straightforward — the Arcadia T5 Kit comes with the controller unit, the tube, and a reflector, and it's designed to sit on top of or clip inside a standard tortoise table. You'll need to replace the tube every 12 months even if it's still producing visible light, because UVB output drops significantly before the light appears dim. Beyond that: swap the 60W bulb for a 75–100W halogen reflector spot to hit that 35–38°C basking temperature, and pick up a cheap digital thermometer with a probe so you can verify the actual basking spot temp rather than guessing. That's genuinely everything your vet is asking you to address.