Very tempting - I'd probably keep the tank heated but would replaced the goldfish with neon tetras or something as they're so pretty when lit up (and the tank is too small to house many goldfish anyway). I'd need to investigate how much the set up would cost and how this was paid for and the daily upkeep - though as I go to the gym every day, I would ensure they're fed daily too.
Unfortunately I think the manager thought my help last time was interferring and that the other guy knows more than me so not sure if my offer to help would be accepted. However, I'm fairly sure the other guy would charge a weekly or monthly fee, whereas I wouldn't so my help would be cheaper too. But I really hate cannister filters, I'm really crap with them so that would be my downfall.