Dear Randy, I had a successful tank running for many months with great acro growth but since a couple of weeks I am struggling to keep alk from dropping. I am trying to raise alkalinity using a solution of water and baking soda but alkalinity continues to drop, today it went below 7. Last week I was able to stop the drop / maintain alk by dosing manually sodium bicarbonate powder vs the solution, but this is only a workaround. I remember a post of yours from many years ago when you mentioned nucleating sites for precipitation and a cycle hard to stop. Is a massive water change the only solution to find a new equilibrium for the tank? Why dosing a solution of water and baking soda is not having an effect on the tank?