Hey, collareds are a beautiful lizard indeed and have been a big passion of mine for many many years. They need watchful care, not set em up and forget type lizard.
The size enclosure your talking can be a very nice home for a trio of even 4 or 5 . Yes one male and a harem :0) Males will fight when breeding age. And they can be old enough to breed at 8- 9 months of age. Adults vary in size but the norm is about 12 - 13 inches long head to tail. Sometimes ya get a biggie, I had a very BIG boy for many years named KONG he was approx. 17 inches long.
As a substrate yes you can use WASHED PLAY sand from home depot/lowes, or hardware store. Paper towels for babys and youngsters.
As far as food, roaches are good, I have had colonies of dubias over the years but find the huge adults are too big for some they won't eat them, Some do. The mid sized and small ones are eaten but must move,,, "collareds love the hunt and the movement". The baby dubias play dead and my youngsters would not notice them. I must admit they are cricket nuts.
So if you used a different and quicker roach it would work well. I personally am not allowed to bring them into the house because they climb, and get out, my husband said he draws the line where they are concerned :0)
They also love superworms and I use gut loaded mealies too. I do not refridge, but keep them room temp and bedded on oatmeal and wheat bran as well as getting greens, carrots....
The big turquiose males are eastern collareds or C. collaris. We call these guys Aquaflames, from the Oklahoma locales.I will post a pic of one of my adult males below.
Hope I remembered all your question, hehehe, lol. If not I do have a collared care page and many other collared photo pages you can take a peek at. They come in all colors and patterns, AWESOME. Be glad to help in any way, just holler ;0)
Shikoba
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Eve
Suncharmers Colorful Collareds & More
