You should consider reading some of the back issues of Advanced Aqurist, especially the chemistry section written by Randy Holmes-Farley. With respect, if you aren't familiar with alkalinity, you have a little reading to do before you can expect to see good results in your aquarium. I can't remember exactly which issue it was, but one back issue had a very detailed article on the relationship of calcium and alkalinity and the different methods of maintaining them. The bottom line is that you should rarely, if ever, adjust one without the other, or you could cause serious problems in your tank.