I don't know this one. How long disease can last in a tank with no fish depends on the disease. It would suck to cure the fish and then let them get sick again. With no filter the ammonia would get up there quick if you feed the fish, then you would have to change water to keep the fish alive and then remedicate. If it were me I'd treat the first tank and watch all the levels. But I really haven't dealt much with disease.
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