Probably not the humidity, some young ones are just more defensive than others. I'm assuming its a baby since you said a 10G tank. Typically they'll grow out of it.
I have a male normal that has literally tagged me 95% of the time I've handled him, just the other day I took him out and was "praising" him for not hissing at me then as soon as I was setting him back in his tub he got me on the hand.







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Yes, he's a baby, only 4 months old. I doubt he's had much handling because the guy we bought him from said he didn't really have time for these two because of his other breeding projects.