It seems to be a combination of high salt, high temp and formalin.
Formalin is specific to ich. Ich occurs when the water temp is cold and/or there is
a sudden drop in temperature. It is often used in spring to knock down spring
cooties. The salt level in winter (cold) is good at 0.05%, higher not recommended.
At this concentration and temp there is no problem using formalin.
Many people bring their salt up to 0.1% as the water warms up, which is the highest
level needed both kind to plants and kind to the fish for long term exposure. Higher
salt levels start to shred GF fins.
The beneficial effect of salt at this level is in stimulating the slime coat and on
the osmotic pressure on fish. It is not in "killing" the cooties. Running the salt
up higher trashes plants, maybe trashes the biobugs and is unreliable in killing
cooties anyway for whatever reason (resistance, etc). So there is no point in
running the salt up. Low salt levels have no down side. Ingrid


~ jan JJsPond.us wrote:
If that were the case, I'd have dead fish, because I know I've used
formalin with salt at .15% with no problems. ~ jan


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