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Old 09-18-2005   #11 (permalink)
Oyagoi
 
Join Date: Jul 2005
Location: Puerto Rico
Posts: 1,228
what is your tds, where does your water come from, and what possible sources of melanin do they have? Are there plants or anything that might be high in melanin that they are munching?

metals dont turn koi black, melanin does, and high ph wiht hard water is what makes it spread. So something has to be going on to cause that much black to be going on.
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