PH dropped not sure why

[williamjhitchcock]

my ph has always been fine around 7.8 at night to 8.3 during day. I recently raised my salinty to 35 since i have an all coral tank and the ph lowered quite a bit 7.5 any ideas here is my parameters.

45 gallon bare bottom tank - 20 gallon sump with cheato lit for 24 hours
good skimmer (air input from outside)
tons of water movement in sump and tank
temp 81
alk 9
calcium 500 (a little high)
mag 1350
temp 81
salinity 35
phosphate 0
nitrate 0
nitrite 0
iodine 6

I was thinking of dosing kalkwasser with my top off just worried it would raise my alk to much.

 

[isildursbane]

The first thing to do is make sure your test is correct. You using a probe? Make sure it is not a faulty reading, then worry about correcting it.

http://reefkeeping.com/issues/2007-05/rhf/index.php