Yep. Absolutely normal. Around our house, we call it being perfect! "Hello Mr. Sir, are you perfect???!!!" They do it when they are at just the right temp and want to stay that way.
Clapton is acclimating okay I think. He's quick as lightning so I'm not sure how much I should bring him out of his house yet. He's not at all interested in his salad though. I wonder if I should change what I'm giving him. Least he's eating his crickets.
Things to do:
Buy calcium powder
Material to raise surface for basking spot
Scenery decals for back of tank