We can't solve your problems, we can only help you solve your own problems.
Looks like you need to do some reading. If you want to go into detail, ask wiki:
pH - Wikipedia, the free encyclopedia
pH is basically the measure of acid or base on a scale from 2-14. 2 being very basic and 14 being very acidic. 7 is neutral. As unwritten law said, you shouldn't mess with your pH too much. Mine has been at a constant 7.6 for the past year or so.
Like I said in one of your other threads, get a testing kit if you don't already have one:
Freshwater Master Test Kit
You get an 8% discount at aquariumguys for being an MFT member! Just PM f8fan for the code.