I had a Golden / Columbian many years ago as a kid… it was ferocious…
I have a 32” female Black & White / Argentinean now who is wonderful. She’s very tame / friendly, but like all women, she has her days…
I’ve heard it explained that the reason the smaller growing Columbians are more skittish / aggressive is because they are viewed more as a food item in nature. Since they are a tough little species, they embrace the fight or flight behavior often choosing to fight.
In the past all Columbians were wild caught or farm bred, and only in the past few years have they been truly captive bred. Having never survived in wild conditions, they are said to be much easier to tame. Yours being only 10” total length when you got him, there is a very strong chance it was captive born. Even if it isn’t, being removed from wild conditions younger will mean those instincts are less engrained.
One ‘trick’ is to keep in mind is in the wild they are often attacked from above. So they will be much more relaxed if you avoid coming at them from above.
Your set up and feeding sounds pretty darn good. Spends lots of hands on time and you should be in pretty good shape.
The Columbian I had as a kid was terrible. It was about 18” long and I suspect wild caught as a juvi. It wanted no part of being held, ran from me when I opened the cage, bit me and whipped me when I reach for it and jump / ran away every chance it had. I kept it for a month or two but eventually gave up and returned it to the store I got it from.
If you ever do have questions I also sugest going to TeguTalk.com I'm Toby_H there
Hey DirtyWhiteSocks... why do you say the Columbians are the only real Tegu species?