dKH - Ca - ph Interesting findings

[maxalmon]

Setup another frag tank and decided to use the B-Ionic 2 step system, here are the initial readings and amounts added. Tank is a 75g with maybe 150lbs of fully cured LR and a 2" LSB. The tank is about a month old tank fully cycled. Using Tropic Marin Pro salt. I never really understood the cause/reaction of dkh and Ca, but after doing this and documenting everything, it now makes sense.
.
Friday Morning
dkh = 5.2
Ca = 440
ph = 7.89
temp 79.8
Added 60ml of step 1 around noon.
.
Friday Evening
dkh = 7.0
Ca = 425
ph = 8.04
temp = 79.8
Added another 30ml of step at 7:30pm (total of 90ml for the day)
waited 1 hour and retested
dkh = 8.0
ph = 7.94 ? odd
.
Sat Morning
dkh = 7.2
.
Sat Evening
dkh = 6.8
Ca = 425
ph = 7.41
temp 79.8
Added 60ml of step 1 and waited 1 hour
.
dkh = 8.6
Ca = 425
ph = 7.68
.
Looks like I need to add 60ml per day of step 1, I'm going to just add it to my autotop off.

 

[lbaskball]

it seems like your ph is wayyyyyyyy slow.
In my tank, i had a problem with dkh and ph. Now my tank is fine FINALLY. my dkh is usually high and calcium around 420 with a ph of 8.33 during mid day. Drops to about 8.00 by night time. (i think my ph probe might be a lil innacurate), not sure if my ph should drop that much.

 

[maxalmon]

The ph bothered me at first, then I realized I was using an old probe, so I ordered a new one with calibration fluid. Should arrive this week and I'll post more detailed ph readings.

 

[reefreak29]

Originally Posted by maxalmon
The ph bothered me at first, then I realized I was using an old probe, so I ordered a new one with calibration fluid. Should arrive this week and I'll post more detailed ph readings.
ph probes need to be calibrated at each use to be accurate , stinks but thats what u have to do