steve, a 4' cage would be WAY to small for an adult indigo. & as far as heat panel, etc. goes, you'd just be wasting your money as they do best at simple ambient room temps. years ago, i built an 8' cage using 1/4'' screening & my unicolors did very, very well in it, producing many clutches. not to mention that it's nice to see them stretch out & explore. mho.......