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Re: ick and malachite green



Tsuh Yang,

My experience with malachite green has always been pretty good. Being a copper
dye, I doubt that it has gone bad if you kept it in a dark bottle and air tight.
I've always used the recommended dose with formalin (2 drops/US gallon), but this
is very hard on scaleless fish and plants. You might be better off using the old
1950s method: raise the temperature to 85F (30C) and do large water changes
every other day for a week to 10 days.

Mike Wise

Piabinha@aol.com wrote:

> a few days ago, a small ick infestation broke out in my 55-gallon amazon tank
> among some tetras.  yesterday, i dosed it with some malachite green that i
> found in my supplies, which is a few years old.
>
> 1.  will this still work even though it is a few years old?
> 2.  will this harm plants, snails, naked catfish?
>
> i've always heard that malachite green was a very effective medication against
> ick.  the label says "use half the amount indicated for tetras and catfish,"
> so that's what i did.  i also raised the tank temperature to around 83 (it was
> high 70's).
>
> thanks for any help.
>
> tsuh yang chen, nyc
>
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