Fish to keep without a heater

Could anybody recommend smaller fish that can be kept without a heater? I have a spare 40l (or thereabouts) tank knocking around and it would be kept in a room that is always around 20-24 degrees. The room houses two other aquariums that run heaters so the ambient temperature is fairly warm. It is also my home office so day-time temperatures are comfortable even during Pretoria winters.

Since it is not a terribly large tank, I am looking into nano fish and have read that Endlers are quite happy with just about any temperature. Does anybody have first-hand experience with them? I am also open to any suggestions.

 

Zebra danios and mollies should be fine

 

Hi,

Have a look at galaxy rasbora, emerald rasbora, white cloud mountain minnows. Those three off the top of my head

 

Thanks, @PappaBear . I have kept Zebra Danios before but their aggressive nature is, I must admit, not to my taste. I watched them bully each other to death until only the largest bully remained. Are Mollies perhaps a little more collegial?

 

Thanks, @TheGrissom . I have looked into the minnows; they seem to be really fuss-free.

 

White clouds are awesome, i have kept them in heated. if they work at that temp you can't go wrong. awesome fish.

 

I will do more research but some breeders report that they can even overwinter outdoors in northern US climes where the ponds freeze over.

 

White clouds are perfect for non-heated and outside ponds

 

@Reedfish , that's horrible! Perfectly natural but also perfectly horrible. Not of your friend, of course. The mental image of a nymph eating a fish is rather grotesque though

 

A lot.of barbs would do great in such temps. Some of them don't get that big !

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