Yeah that’s right. White Spot Disease actually looks like “Sliming Up and Turning Pink” (and dying) in goldfish and Koi. Worse, you can’t see “pinking” in little black Ranchus. (My most recent housecall.)
Much more lethal in smaller fish. Not uncommon. And very responsive to salt.
So if you have fish that are starting to die off, and they’re sliming up (getting slimy) turning pink and lethargic, and: YOU CHECK THE PH AND IT’S OKAY
Then your second-best-guess is ICH – especially if the fish in question are goldfish.
Because in Koi and goldfish, Ich just looks like ‘pinking up disease’ or something. They almost never develop the White Spots the disease is named after.
Salt works better in warmer water, so if you can get the collection to 76-78 dF with high aeration it works better.
There’s a good easy salt article over at savingsickfish.org
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