hi everyone just want to share and possibly get some feed back from the more experienced keepers regarding a previous post i put up in trying to find out what was causing me so many problems in the koi especially in the dorsal fin area
over the past 12 months iv been quite confident in conducting scrapes and treatments however same problems would surface yet again
back to basics AGIAN

water/scrapes ect then thinking am i scraping regular enough but surly i should only be doing this if the koi's behaviour is not normal so back track again

then it dawned on me about the Bio chips iv added last year in the outer chamber of nexus {14ltrs} of the stuff along with 150ltrs of k1 SO today scooped out all the k1 whilst chamber was still full of water to separate k1 for chips then dumped the chamber and low & behold Bottom of the nexus was the bio chips FULL of crap/shite ect
so this is my thinking that because the chips have just been sat there that this has been my problem all along causing bacterial issues
am i heading down the right track ???
water test 5hrs after filter clean are
Ammonia 0.18 ppm was 0.35 other day
nitrite 8 ppb
ph 7.8 and kh 3.5 [soft water area]
sorry bit long winded but would just like to hear bk from ppl to see if im doing the right things