Hi there
Alkalinity and Kh are one in the same.
It should be anywhere between 7 and 11 maximum.
Mine is at 8.
What test kits are you using?
Do you dose for the calcium and dkh? And if so what are you dosing...
Nitrates are an issue in tanks. Not enough water changes,clean up crew,overfeeding.
Do you have a sump? If a filter do you clean it regularily?
Any sponges that collect gunk.
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