There's no need to cycle your tank all over again. Since all your fish in the tank have been affected, I would suggest putting the pair back in the tank and getting a heater that is suitably sized for your tank. Put the temperature up to 32 degrees and maintain it there for 10-14 days. That should suffice in eradicating the whitespot from your tank. If you want to be extra sure that you eradicate the parasite, combine the heat treatment with medication for Ich as well. However, do note that such medication generally will kill invertebrates such as shrimp and snails in your tank.
Be sure to couple the heat/medication with vigorous aeriation in your tank as well as DO NOT stop the treatment at any point before 10 full days. This is because at certain stages in their life cycle, the parasite is more or less invulnerable. If you do not continue the treatment for the full cycle, you may end up with surviving parasites.
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