So I was setting up a new tank and in the process of choosing a filter and heater when I friend brought me her filter and 2 fish. They had been living in a very small tank ( maybe 5g) so they love the bigger 10 g tank. I was not thinking a throw out the filter and but in a clean one before setting it up and adding the fish.( When I got home from work the fish where there and had been in a small container for a few hours I wanted to get them in to the tank as quickly as possible. ) It the tank going to need to be cycled? I don’t want to add any more fish till I know these are ok and the tank is cycled ok. Also I think I was given two Barbs, what would be a good addition to this sparsely stocked tank? Oh I also don’t have a heater and live plants are these necessary?