Dont koi get what they call black blood if you have high nitrate levels , I think I read or heard it somewhere a long time ago ?Correct, then read the bottom sections of "nitrate tolerance", that is stating "Goldfish can tolerate levels in excess of 1,000 mg/l with most other fish falling between the two.". mg/l = ppm.
So, it is all about the fish species rather than a broad generalization.
Dont koi get what they call black blood if you have high nitrate levels , I think I read or heard it somewhere a long time ago ?
Dave
Yes agreed Charles one should never allow it to get highI have no idea, but it would not surprise me. Personally, I would never allow the nitrate to get too high.
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