well I will chime in, you could say I collect antique tanks because when I see one I buy it even if I wont set it up right away. I have quite a few things in my basement that I have mass acquired so I can't take picks but here are a few
this will be my showcase betta walls when I do my fish store, they date back to the 1950's and came out of a hardware store in rural sask., it will be so cool when I set it up as the fish will be able to see the one beside it and it is rewired to run all six tanks of a single plug.
I also have a few other ones, like this one that I got from a guy who was about 70 who had had guppies in it since he was like 12 or so. had quite the story behind it and came with a killer antique stand.