I have a 15l aquarium with 5 White Cloud Minnows and a Hong Kong Pleco who all get on well with each other. I would love to add more fish to the aquarium and I was thinking maybe guppies. I have been doing a lot of research in them and apparently they get on well together but I don't have a heater in my aquarium Would I need one if I was to get guppies?
If I can't get guppies then what other fish would you recommend?
Thanks in advance!