If ich gets introduced, it can be starved out of a tank by going fallow
. The free swimming stage needs
to find a fish host or it perishes, thus ending the lifecycle. Now, if you later introduce an unquarantined fish (with trophonts) or a coral/invert (with tomonts) that reintroduces ich back into your DT and the cycle repeats itself again. This is why I stress quarantining anything wet
for those wishing to keep pathogens out of their DT.
Here are two important reminders when going fallow:
- Raise water temp to at least 81F for 6 weeks: New Ich Fallow Period
- You must eliminate any hypoxic/anaerobic regions in your tank whilst going fallow. If a protomont crawls into a hypoxic environment before encysting, it may go dormant and all bets are off! This is probably the "real reason" behind most fallow failures. More info on that here: Why a fallow period will sometimes fail