Your KH seems to be on the high side. Check your gravel with vinegar for stuff like limestone or something alkaline which might be the cause why your KH is so high. Is your pH 8.0 taken before CO2 injection? If it is during CO2 injection, most likely there is too much loss in CO2 or not enough CO2 generated by the DIY unit. What type of filter are you using? Give us more details to determine your problem. []
" Singapore's tap water pH is 8.0 in some region...cannot believe in the first place..do not be shocked [] "
Plant Physiology by Taiz and Zeiger
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