What ????? , we thought you had 9 koi in your pond "jesus man youv'e played a dangersous game there my friend one that could have cost you everyone of those fish".......Haha no.... I have 17 KOI 1 goldfish and 1 pleco...
However it seems as your ammonia has converted nicely, Calvin as I said it would its spike and then gradually decreased , so now the nitrite should spike and that will be the end of it hopefully .
However take note of what I've said otherwise your going to end up in no end of trouble again and this time you may not be so lucky as you were this time 17 koi 1 goldfsh and a pleco is more enough for your pond no more than that .
Dave
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