great! it worked! I raised my kh by 4 and the ph went up.... a little!

so I know have a kh of 7.5 for a ph of 5.6 (was 5.5 before so no big change). I'll wait until tomorow and see if ph goes up a little more like it should be (according to the link you gave me).
by the way, what should be the kh limit to reach? I like to make experience but do not want to kill what's in the tank.