ph ok?

[Jerv]

Alk is between 11 and 13. Cal is 420. My ph is 8.4 lights off 8.6 lights on. Is the ph reading ok or is it to high ? Water temperature is 77 to 80

 

[frisbee]

It's a little high. Check these out.

http://reefkeeping.com/issues/2005-03/rhf/index.php

http://www.reefkeeping.com/issues/2004-05/rhf/index.htm

HTH.