u can treat white spots easily with a heater to keep the temperature of water at around 28-30 degrees C with medication. It should go off in 1 or 2 days.
As for a filter tank ... i usually keep a 2 ft vacant tank just incase ... anyway, it's relatively cheap to get a 2ft tank nowadays. Btw, u don't even need to have a filter when treating your fish in a 2 ft tank as u only need to treat them for 2 days ... just some air bubbles will do.
Its all from my experinece....
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