Ich has about a 4 week cycle ... about 1 week in the cycle it will be visible on the fish ( the other 3 weeks it will be in either egg/larvae/freeswimming ) ... As Alan suggested you have to leave the tank fallow to be sure that once they become free swimming again there is no host available for them to latch onto.
Cheers
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Steve
“The most important decision you make is to be in a good mood.”
― Voltaire
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