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[APD] Re: Aquatic-Plants Digest, Vol 23, Issue 32
To try and defeat an ich outbreak in my tank I am in the 3rd week of an
'every other day 50% water change' regimen with temps up around 85-86.
The recommendation to raise the temperature does little good. I put it in
the class of aquarium myth because, though it does speed the life cycle of
the ich parasite, it also decreases oxygen levels in the tank. If the fish's
gills are loaded with ich parasites, decreasing oxygen may kill them when a
longer cycle of infection won't.
I was unable/unwilling to use any medications for fear of losing/harming
plants/shrimp/botia. In the process I did lose a Cory or two but others
(including Neons) have made it through the spots unscathed.
Straight malachite green ich medications work very well and very fast. Treat
every day until the dots are gone, and then at least one extra day, as the
parasites can only be killed in the stages where they've dropped off the
fish. Typical treatment is 3 or 4 days. Be sure to remove carbon from the
filter during treatment, as it removes the medication. Malachite green will
slightly color the water for a few hours. Repeated use may slightly stain
silicone seals in aquariums. But, properly dosed, MG won't hurt your
plants/fish/inverts. It's recommended to use half doses for tetras and
scaleless bottom fish. No additional water changes are required.
Malachite green is very safe. When I was a retailer with up to 700 tanks,
we'd use it to treat all new arrivals, and sometimes the entire store
systems. We never found it to cause problems, and that was using it on just
about every fish/invert/plant species known to man.
I would avoid the formalin/malachite green formulations, though. They are
supposed to work better for killing ich-- working synergistically
together--but the formalin can be tough on plants (depends on the dosage)
and water quality. Plus, it messes up the accuracy of some ammonia test
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