07-20-2012, 10:14 AM
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At 88 you should have seen some results, at 85.5 degrees Ich is inhibited (but perhaps not prevented) from replicating.
At 84 however, there is nothing but a faster Ich cycle. Fish can normally fight off Ich if they are healthy and stress free, after all Ich is present in nearly all aqariums and fish stores (if a fish shows ich in a store, they'll remove the fish but not treat their entire multi-tank system).
It takes a temperature of 91 to outright kill Ich.
I would try using a medication, something like Coppersafe which is safe for use with live plants and I've used it without harming ghost shrip and malaysian trumpet snails. At 84 degrees, you should be spot free within 4 days (personal experience is 2 days for mild case of Ich). The full lifecycle of Ich will be somewhere between 4-6 days at that temperature. Treat for one full week.
Durig that week, do not perform water changes. Ich numbers in the hundreds and is everywhere in the tank. Changing the water will not achieve anything in terms of Ich, and should only be done if your tank is not cycled. The reason to not change water is to reduce stress, and not deal with the headache of dosing medication into the new water before adding it to the tank (to maintain constant medication level).