Yes, it's normal, but you are doing some negative reinforcement by forcing said Tilapia to smell your sandal before release.
You you telling us tilapia have a shoe fetish? Gosh I keep learning more stuff about tilapia every day!
There was a weird guy in my college dorm that had a sock fetish. My dastardly roommate told him my socks stunk. The guy sat down next to me at lunch one day and grilled me about my socks. I almost killed my roommate.
