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101010, I can only speculate but in a month a cyst could have hatched and infected the fish . Now how that happened I can’t tell you . But you should try the tank transfer method with all fish and then Qt . This way you try to minimize either infective stages or the cysts by leaving them behind after each new transfer to a fresh tank. That’s done every third early morning . There are extensive write ups in the sticky section of this fish disease forum on how to do the TTM . I assume all fish are infected with ick even if not showing symptoms. You tend to see th3 symptoms of white spots when many of them have attached to the fish. You may have missed seeing a white spot then it probably dropped and then hatched later and then you see the symptoms.
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