Cold water and tropical fish...

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Recently, after i thought my lfs had drastically improved their fish keeping skills and advice to newb's of the hobby, i went down there and discovered they had set up a new cold water tank with ("shock") guppys, platys, mollys, plecs, CAE's and corys.
These fish, i thought to myself, are tropical not coldwater for good reasons; keep a tropical fish in a cold water setup and you will significantly reduce its lifespan, state of health/happyness and significantly increase the chances of it getting deseased and/or stressed out; many tropical fish do not mix well with goldfish for example.
I wanted to say somthing but the only person there was the lfs's owners wife who realy doesn't know a thing about fish and was just watching the store while her husband was out having lunch so i decided it wasn't fair to have a go at her since she wasn't in charge.
I ended up buying a guppy female who i felt sorry for because she was barely half grown and was getting badly harrassed by 4 adult make guppys.
But now i have got thinking about it, are there any exceptions to keeping these fish in cold water setups or is it just like i thought, just plain cruel?
If people go to the lfs and see tropical fish in a coldwater tank they may think its fine to do so which is what im most concerned about because it would be bad if this behavior became even more widespread...
 
Maybe white cloud minnows if they're in a warm enough room? (or anything tropical in a REALLY warm room).

were they not all practically asleep? I don't know, but I thought tropical fish would slow metabolism right down and stop doing much if it was cold? was the shop stupid-warm, therefore the water temp...?
 
Not the shop wasn't very warm and although the fish wern't practically asleep i think this was because of the complete lack of female livebearers in comparrison to males and so all the males were busy chasing the females around the tank.
 

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