Blue & Rhino Iguana Shared Room Heating Guide

Running a blue iguana and a rhino iguana in the same room is a real balancing act — blue iguanas need basking spots around 35–38°C, while rhino iguanas run hotter at 40–43°C, and getting that wrong consistently leads to metabolic bone disease, immune suppression, and chronic respiratory infections. Getting heating and UV right is genuinely the single most important factor in keeping both animals healthy long-term. To give you the best steer: what size are each of their enclosures, and what heating and UV setup do you currently have running for each of them?

That's a really common frustration and the fix is straightforward — you need dimmer-compatible halogen floods paired with a proper dimming thermostat on each viv. Right now you're trying to solve a variable problem with fixed-wattage bulbs, which means you're always chasing the temperature rather than setting it. The product I'd recommend is the Habistat Dimming Thermostat. It's a proper proportional dimming stat, widely used with halogen basking bulbs, and it lets you set an exact target temperature at the basking spot. Run one per enclosure, use 100W halogen floods in both, and let the stat do the work — your rhino's stat goes up to around 42°C at the basking surface, the blue's sits at 37°C, and neither fluctuates more than a degree or two. You stop guessing, and both animals get consistent, correct heat every single day.

Yes, probe placement is everything — this is probably why your temps feel inconsistent. The probe needs to sit at the basking surface itself, right where the animal actually sits. For both iguanas that means on top of the basking rock or branch, not in the air nearby. Air temperature around a bulb reads very differently from surface temperature, which is what matters physiologically. Fix the probe flat against the basking surface with a small cable clip or a bit of tape underneath, keep it out of direct line of the bulb beam so it's reading conducted heat rather than radiated, and the stat will then hold the surface at exactly your target. One probe per enclosure, one stat per enclosure — don't try to share or average across the room.

You've got it exactly right. Blue iguanas are forest-edge animals and do well on the Arcadia 6% Forest tube at the distances you'd expect in a 4ft tall viv. Rhino iguanas are from semi-arid scrub in the Caribbean and need higher UV exposure — the 12% Desert tube is the correct choice. The only thing to double-check is tube-to-animal distance: with the T5 12% you want the rhino basking at roughly 30–40cm from the tube for the optimal UV index, and make sure you're replacing both tubes every 12 months regardless of whether they're still emitting visible light, because UV output degrades well before the light appears to fail. Your UV setup sounds solid — it's really just the thermostatted basking that needs fixing.

Definitely worth taking seriously. Both species are territorial and visual contact alone can cause chronic low-level stress — you'd see it as darkened colouration, reduced appetite, and glass-surfing. The simplest fix is a visual barrier between the vivs: an opaque board, a piece of foam-backed vinyl, or even a tall plant shelf between them. They don't need to be in separate rooms, just out of each other's line of sight. Once you've got the basking temps dialled in with the Habistat stats and removed the visual stress, you should see both animals much more relaxed and feeding consistently.