I have been battling a low alk problem for the past two weeks i have done about 70-80 gals of water changes to correct and my alk would never go higher than 6...(using api test) so last week i ordered an elos alk test...havent done a water change since wedenesday tested thursday still 6 on alk...got my elos test in sat...checked the alk today wow 11alk...I would check your test kits may save you some salt...elos is obviously better than api but is there away to check the elos test kit
chris
chris