I have a 80g cube, 100g total water volume with sump and I’m dosing B-ionic 2 part at a rate of 150ml a day and I’m still dropping 1dKh / day. The tank is 7 years old, has coralline covering 2 walls but no corals at this time. 150ml seems excessive for a 100g system and I’m hesitant to just keep pumping up the dosage. When I did have corals I was only dosing 40ml a day and maintaining my KH around 9. I’m not seeing precipitation on heaters / pump or a hard sand bed. Any ideas on why the tank would have such high Alk demands and should I just keep pumping up the dosage till it stabilizes? At this point I’m just trying to maintain 8.5.