I'd slowly dose to reach the desired alk. Your tank volume is very small so dosing even moderate amounts of the concentrate Randy reccomends should do wonders for you . I only dose 1/2oz per day of the additive and my alk stays pretty high that way. I speak dKH, not meq actually but if memory serves you want an alk of around 3.3-3.6meq. I know in dKH its 9-12