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Tiu didn't like us disturbing his quiet existence by cleaning the tank and left his/her hidey hole in order to crawl into another one, hopefully a more peaceful one.
Tiu left his hiding place (a miniature flower pot) to go roaming around during cleaning of the tank. He was a little confused that his floating island had mysteriously sunk lower. Water level being low due to us changing the water, his/her usual path suddenly had a bit of a drop and here Tiu is contemplating whether to risk it or not.