Ph drop

[MizTanks]

Why would my ph drop? Temp=78, cal=380, Kh=12, sg=1.025, salinity=30 and the ph is between 7.8 and 8.0 I've always had a ph of 8.4 without additives.

[ReeferRob]

There are a number of reasons why your pH could have dropped.
Typically pH does fluctuate from day to evening.
This could be caused by insufficient aeration or surface turbulence.
Could be caused by excess CO2 in the house, typical of winters where we button up the house pretty tight.

Heres a few links to read over!
http://reefkeeping.com/issues/2006-06/rhf/index.php
http://reefkeeping.com/issues/2004-09/rhf/index.php

First one might be more than you want to know about chemistry but the other is a great read specific to this topic.

Hope it helps, let us know.

[Sir Patrick]

^ +1- great info!