pH Issues

[sailfin]

OK guys I just got a pinpoint pH monitor. I have a little issue. During daylight my pH is 7.9, a little low. Night time readings are 7.7. I have never tried to raise pH before. Do any of you have any suggestions? Please advise.

:question:

 

[minireefer]

Maybe some kind of buffer.I have used seachem marine buffer in the past with good results http://www.drsfostersmith.com/produ...x=mode+matchallpartial&Np=1&pc=1&N=2004&Nty=1.
Although most buffers will raise your alkalinity abit to.Have you tested your alkalinity if it is to low your PH may very.Sometimes when using RO water your PH may become low do to mineral stripping.I think John has talked about a product called OSMO Prep Marine for use when running RO water http://www.drsfostersmith.com/product/prod_Display.cfm?siteid=0&pCatId=4127&js_enabled=0