Oh, finally, a responsible, curious, and caring Nile Monitor Owner. You are right for asking questions.
First off, if you haven't already built the cage, make it a foot shorter tall. They never go up high, trust me, I know this I have two wonderful Niles right now. And a baby in raising. Make the substrate very deep, maybe seven inches to a foot. They love making their own dens, if you don't have access to decomposed granite soil, get a clayish dirt you might have in the damp areas of your area. It holds dens wonderfully.
Second, you will need two elevated basking spots, to allow for variation, it also helps to have two elevated spots if you expect to house him with another animal, I'd say two one hundred watt Basking bulbs should do it for that. Get a temp gun if you don't already have one, his basking surfaces should be 100-150 degrees, elevate or lower the spots till you get what seems good for your monitor.
Third, although it isn't a water monitor, I highly suggest soaking weekly in room temperature water for about an hour, this gives you time to rearange the cage, they love that, it gives them something to do, *explore*.
Fourth, I suggest using leather gloves when handling your Nile, they will scratch and bite sometimes...but once you get the handling down to a regular monthly or every other week schedule, they will calm and become used to you. I see he has a bit of a temper and tendancy to bite, lol.
Fifth, try to keep ambient air temperatures at around eighty seven or so degrees, that is what seems to be good for mine. As for the finish, I love mahogany, thats what all my furniture is in my room, It is safe to stain the OUTSIDE of the cage a week or so in advance to caging the Monitor, or until scent runs off. Also test the heating and lighting a day or so in advance too. I find that cutting holes in the top of the cage, wood, and screening them off works well for lighting placement, cut the right sized hole, screen it, then place the light on it. At home depot they have all sorts of sealants you can use, just don't get something black, it attracts the Niles, they don't come in contact with this strange black stuff in their normal habitats, if you can't find something not black than cover it with tape I'd suggest.
I hope all of this helps you out.
I am overjoyed to find someone who cares about their Nile, and isn't afraid to ask questions.
Don't be discouraged if others say that it won't work out.
They are not vicious, not if you care for them.
-John May
Water and Nile Monitor Enthusiast
"We cannot fight communism all over the world..." - John Kerry, Post Vietnam
"Mr.Obertraff, tear down this wall!" - Ronald Reagan Post Vietnam
John Kerry was wrong then
"We cannot fight terrorism all over the world..." - John Kerry
"We will make no distinction between the terrorists who committed these acts, and those who harbor them..."
And he's wrong now.