Wife's sister, and you're right... he wouldn't even notice.
It made me look at how I am caring for my Scotts Damsel. It is my only fish and it lives in a system with 40gal of water, 50lbs live rock, chaeto fuge, and a 7gal water change every 10 days. I use a tdi meter to check my ro/di water and a refractometer to maintain salinity. It was unsettling to see someone who didn't really care about the environment he was providing and makes me wonder just how many people out there are doing the same thing. I've heard a couple of horror stories about people bringing a "nemo fish" home and dropping it into their freshwater aquarium
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