PH - What it is and how to raise it!

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Hi All,  I had a viewer write in asking me what an Ideal PH range is for a reef and how he could go about raising his PH.    

PH is one of those funny thing not many test unless they have a controller.. then some seem to obsess over it (i used to!).  I ended up making a video for the guy and figured i would share it as i kind of did a brain dump on everything PH. hopefully it helps some of you guys out.