If you ever plan on keeping corals its something to learn. There is a relationship between the two beyond the numbers. Look for posts by broomer5 , i think it ends with 5 its at least broomer, on the subject. He's explained it bazillions of times.
Until then i would stick to regular water changes to keep things stable for your invertebrets who use alkalinity to create their shells. Alkalinity/dkh, which are one and the same, is carbonates and combined with calcium form calcium carbonates which is essentailly the skeleton of inverts, corals and corraline algaes. But like i said until you wish to keep corals i wouldn't worry about it and stick to the water changes to keep things right. Always remember, when in doubt, do a water change.