I get the occasional "tanks looking nice" but not much interest in the fish themselves beyond them being amusing to watch when being fed for a few minutes. But my mum gets stupidly attached to individual fish, mainly babies, and names them (grr), then cries when I'm chucking them in the bin cos they're dead for some reason.
The first time my sister saw the tank she stared into it for five minutes, and I was thinking "aw, it's nice when someone appreciates it", but then she pointed at an albino cory and said "these things look like dead fingers", and walked away. Nice.
But she did get attached to the dwarf gourami in my pic and call him Raymond, so she must've paid a bit more attention at some point.
Nobody understands why I spend so much on the tank and fish. Luckily we all have a safe space here with people who DO understand...