So I was giving away a free tank that was 30" x 18" x 25". The person I was talking to who claimed it, we had a chat about him upgrading his bearded dragon's current home that was a 20g High 24" x 12" x 16", which sounds good for the beardy, but would this be good enough for a long term home?
Both of those are kind of small for an adult (consider they are usually 18-20'' long or so). 25'' tall is about what I'd want for an adult (unless the top can be left open and lights suspended overhead). I would probably want at least 48'' in length and 24'' would be better for width than 18''.