Nononan, I remember you mentioned before that you had something that measures both temperature and salinity or pH in one go. Are you using an electronic pH meter? Sometimes it's important to know what you use to measure pH just to make sure what the test tells you is really what the pH is. If you aren't sure what your test kit is like, you can take a picture and quickly upload it onto this website.
Until we establish whether your test kit is accurate, it's best that we don't do anything to change your tank yet