Going out on a limb here...
Ich is a stress related disease usually if there is no stress the Ich is not infective (actively) which is why often when you introduce a newcomer to the tanke the newbie gets it, while the rest do not.
The stress causes here is obvious. One the fish get settled down from dosin then put them back in the tank. It takes 5 days for ich to fully go though it's life cycle. So, if there was no futher fish in the tank that were ill (with ich) It should be cycled throug for the most part.
But your fish back in the main tank. But before you do, check your nitrates and pH to see if things are screwed up.
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|NAS- If it's not broke, don't fix it.
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