Rabbits Fish

Bought 2 pairs of rabbits fish today, heard that they can "multiply" so fast, so i bought this 2 pairs to fill up my fish tank. But recently weather seems to be cool, i just worry that my rabbits fish will infected by the white spot virus...don't know how to prevent it. i installed a heater on the tank and hope this will take away the virus then. Anyway, looking forward for my fish to getting more and more now. By then i will post some picture up here~!