So after a lot of researching on Rosy Barbs and after I bought 4 of the very pretty fish (2 females, 2 males) I've decided save some money and breed them to finish their little school, then I can go on with my other ideas of fish.
But I don't really want to buy another another filter, my tank is about 15 gal
(about 60 litres?) and I have another tank with one Rosy Barb (I know they're better off in larger schools but my sister wants her own tank with her own fish and I promised to get her my 'babies', and she's agreed to move her Rosy Barb in my tank while mine breed in her little tank). Would they be okay breeding without a filter and heater? We've had Rosy Barbs for about 10 years without a heater so I'm guessing the heater part would be fine?