I got one about 3 weeks ago, he stays hidden 100% of the time. After over a week of not seeing him at all, I really scoured the tank to find him hiding in a hole of the rocks.
I have a plenty of hair algae and haven't noticed any change in the amount since I have had him.
When I first got him and before he found all of the good hiding places, I seen him nearly white then again nearly black. It seemed to me more of a camoflage thing then mood, but that is only based upon a few sightings.
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