02-09-2009, 02:14 AM
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do you know your alk, mag, and ca levels? how much do you dose, how often? what time of day is your pH test performed? if you test your pH before your lights come on that will be your "lowest, low" and if you test before your lights go out, that will be your "highest, high"
what kind of water are you using? there are no fish in the tank? corals? the reason i ask so many questions is because the more info you provide usually the more info can be provided in return.
your going to want to remove the HOB filter as they are nitrate factories and do more harm then good, this is prob. where your nitrate reading is coming from. your also going to want to slowly (over the next couple days) raise that temp to about 78-79 degrees.
skimmer, flow, quality live rock, sand and water changes is plenty to keep your nitrates down.