I did some research on this when I was getting my custom cage made for my baby dragon. I believe 48" x 24" x 24" is the average "large" sized enclosure people reccomend. The one I had built is 72" x 24" x 24", and it looks huge. My baby dragon, Rygel, was far too small for it when it arrived, so he's in his "baby" cage at the moment, but we'll be moving him into his big home sometime in December.
The most important things to consider are width (needs to be wide enough to accommodate the whole length of your beardie, and allow them to turn around without bashing their tail). I believe ideal length is anything from 36" and up, and height is probably best if it's not too high as it could be harder to get temps and UV height right. I believe 18" - 24" is about the average for height.
Best? As big as you can give. I have a 4x2x4' and would go bigger if I had the space. I follow a blogger with a 5x3x3 that gets fully used. There is equipment available these days to heat and light even very large enclosures, it just depends on how much you can spend. Bigger enclosures allow more space to exercise and provide enrichment and all around I always recommend as big a setup as you can reasonably provide.
I agree, custom build as large as you can. I have a relatively small apartment and my tank is only 36''x18''x18''. I'd love a larger tank but to compensate I set up two portable basking lights and give my guy free reign of the (safety checked, animal free) place when I'm home.
I have questions about bubbles on our bearded dragons eye.
So he’s gotten bubbles on his eye. We wiped them off and it’s only been twice in the last few weeks. Should we be concerned? No coughing or congestion. He’s very hungry and sleeps well. He’s 8-9 month range. His humidity is 30-40 day time and as high as 50-55 at night to early morning.
Should we be concerned?