Bearded Dragon Tank Setup: Temperature, UVB, and Everything Else

Bearded Dragon Tank Setup: Temperature, UVB, and Everything Else

Bearded dragon husbandry has moved on from what a lot of old care sheets still say. Bigger enclosures, stronger UVB, and more careful temperature gradients are now the standard. This covers the setup itself, for costs, budgeting, and ongoing supplies, see our Bearded Dragon cost guide, or the full Bearded Dragon care guide for diet and enrichment.

Enclosure Size

4x2x2 ft (roughly 120 gallons) is the adult minimum, not an upgrade you'll get around to eventually. As a rule of thumb, the enclosure length should be at least three times your dragon's total body length. A front-opening enclosure makes daily handling and cleaning much easier than a top-opening one.

Temperature Gradient

Set up a clear warm side and cool side, and check both with an infrared thermometer aimed at the actual surface, not just the air.

UVB and heat are two separate jobs, and mixing them up is one of the most common setup mistakes. A T5 HO UVB tube supplies the UV your dragon needs but produces little to no usable heat on its own, it will not get the basking spot to temperature by itself. Pair it with a separate basking bulb (halogen or incandescent) positioned over the same basking platform, and confirm the actual surface temperature with an infrared thermometer rather than trusting the bulb's wattage.

Only add supplemental heat overnight if your room regularly falls below about 65°F, and use a ceramic heat emitter rather than a light so it doesn't disrupt sleep.

UVB Is Not Optional

This is the one piece of equipment worth spending real money on. Bearded dragons need strong UVB, specifically a linear T5 HO tube (ReptiSun 10.0 or Arcadia 12% Desert are commonly recommended), spanning about two-thirds of the enclosure length.

Target a UVI gradient from 0 up to 4.0-4.5 at the basking spot, measured with a Solarmeter 6.5 if you want to be precise about it. If you keep a hypomelanistic, silkback, or translucent morph, dial this back to a UVI of 3.0 or lower, those morphs are more UVB-sensitive and can be burned by standard output.

Mount the fixture within 12 to 18 inches of the basking surface, and never behind glass or plastic, both block UVB almost entirely. Run it 10 to 14 hours a day, and replace the bulb every 6 to 12 months for T5, every 6 months for T8, and every 6 to 12 months for mercury vapor bulbs. UVB output drops off well before the bulb visibly dims, so replace on schedule rather than waiting for it to look old.

A bright daylight LED around 6500K alongside the UVB helps with activity and appetite. If you want the biology behind why this is the one bulb you cannot cut corners on, our guide to why bearded dragons need UVB lighting covers what actually happens inside a dragon without it.

Humidity

Keep it low, 30 to 40%. Bearded dragons are an arid species, and excess humidity is a direct path to respiratory and skin infections. A basic hygrometer is worth the few dollars it costs.

Substrate

Paper towel, newspaper, or tile are the safest options, especially for anyone new to keeping dragons. Avoid loose sand, including calcium sand, along with wood chips and gravel, all of which carry a real impaction risk if ingested. Our Bearded Dragon health issues guide covers what impaction actually looks like if it happens.

Experienced keepers sometimes go the other direction and run a bioactive substrate, a deep naturalistic mix with live plants and a cleanup crew of isopods and springtails that processes waste for you. It's a bigger commitment than paper towel and it isn't where most people should start, but our guide to bioactive setups for bearded dragons walks through what it actually takes.

Furnishings

• A basking platform (rock, slate, or sturdy wood) positioned directly under the lamp
• At least two hides, one on the warm side, one on the cool side
• Sturdy, well-anchored climbing branches
• A shallow water dish

Cover three sides of the enclosure to cut down on reflections, which can stress a dragon that mistakes its own reflection for a rival. Skip hot rocks entirely, they're a common cause of thermal burns.

Diet, Briefly

Bearded dragons are omnivores, and the ratio shifts with age: juveniles eat roughly 80% insects and 20% greens, while adults flip to about 80% greens and 20% insects. Dust feeder insects with a phosphorus-free calcium supplement near-daily for juveniles, 2 to 3 times a week for adults, and add a multivitamin once or twice a week. Gut-loading insects before feeding improves their nutritional value.

For handling once your dragon settles into this setup, see our Bearded Dragon handling guide, our enrichment guide for climbing, digging, and free-roam once the enclosure itself is dialed in, or browse the rest of our Lizards care guide category.

If the lighting side of this is new to you, our complete guide to UVB lighting covers Ferguson Zones and the mistakes that cause metabolic bone disease.

Printable Guide

Want this as a printable reference? The Bearded Dragon Care Package turns this guide into a 22-page PDF you can keep by the enclosure, $8.99.

Sources & Further Reading