View Full Version : Ph climbing

07/30/2014, 11:43 PM
Any one got any idea why my Ph has been climbing? Up till may my tank ran between 8.17 to 8.34 and now im running 8.3 to 8.48. I haven't changed anything expect adding biopellets and a huge skimmer. The old ev240 skimmer you to have a lot of movement in the first column in the sump. Thoughts?


Randy Holmes-Farley
07/31/2014, 04:12 AM
Are you now opening windows in your home more?

It might just be drift in the pH meter calibration.

How are you supplementing alkalinity?

07/31/2014, 01:30 PM
No no change in windows opening. I tried to recal my apex 3 times ends up with the same reading everytime. I am using dosing pumps. I was using soda ash from BRS but 2 weeks ago switch to the bicarbonate and thats kept me out of the 8.48 range as of late. Tanks is 4+years old ran a reactor up till july of last year when I switched to the soda ash.

07/31/2014, 03:48 PM
I'd guess that recalibration might be useful, but there's a lot of possible causes. That range is safe, though, so I wouldn't do anything drastic or worry too much.

07/31/2014, 08:06 PM
It has only changed by a tenth of a pH point. That's not enough to really say it is climbing. That may just be noise or the probe may be drifting a bit. Either way I wouldn't give it a second thought unless it keeps going.

07/31/2014, 08:56 PM
Problem I was having it it was causing the apex to stop dosing and send an alarm because it was hitting 8.5 when it was up in the 8.4s

08/01/2014, 12:13 AM
Could it be caused by the fact there was more movement coming out of the skimmer. Would a air store help bring it down. I don't like it running that high not much room for error.

08/01/2014, 01:54 AM
What is your alkalinity? It could be a carbon dioxide issue because you have new skimmer. If you want a quick fix you could drop seltzer in there 6ml per gallon, will drop it by . 3 units. Adding aeration is the solution to the problem but is pretty hard to achieve. Here's the article by Randy Holmes Farley http://reefkeeping.com/issues/2005-03/rhf/

Randy Holmes-Farley
08/01/2014, 04:11 AM
Whether more aeration will bring the pH down depends on the alkalinity and the CO2 level in your home air.

What is the alkalinity?

08/02/2014, 12:08 AM
Alk is at 187ppm or 10.472 dkh. I was just looking at my apex chart ph starts at 8.24 in the mornings and hits 8.45 by night.

Randy Holmes-Farley
08/02/2014, 07:15 AM
Given those readings, more aeration will bring down the high end but IMO there is no reason to. I ran my tank for years between 8.35 and 8.5 and it was fine, and I think if anything, corals may grow faster at higher pH. :)

08/02/2014, 08:06 PM
Ok thanks Randy. Should I go back to soda ash I noticed I use a lot less of it. Then adj my apex to allow the high ph?

08/02/2014, 08:48 PM
The soda ash will raise the pH some, but otherwise should be fine. It's a more potent alkalinity source, so it should take less when compared to baking soda. Either should be fine. I'm guessing the soda ash is a little cheaper, but I haven't checked BRS prices to be sure about that.

08/02/2014, 10:10 PM
Its what I was using up till 2 weeks ago but was afraid of hitting the 8.5 level so I went the other stuff. I dont remember if I said but I did add biopellets to the system not sure if that makes a difference

08/02/2014, 10:16 PM
The bio-pellets should leave the pH basically unchanged unless the tank has marginal aeration. Poor aeration could cause the pH to drop due to a buildup of carbon dioxide.

08/28/2014, 06:55 PM
Randy will using the soda water method pull the alk level down ?

08/28/2014, 10:51 PM
Seltzer water won't change the alkalinity. Well, unless you dose enough of it to start dissolving live rock and sand. :)

08/29/2014, 12:53 PM
My ph runs about 8.5 to 8.6. Im lost on why. Cal is 460 Alk is 10 an Mag stays around 1220 to 1300

08/29/2014, 06:59 PM

Unless the tank is being dosed with a high-pH additive, I suspect the reading is in error, but photosynthesis can drive the pH up during the day. Usually, aeration in our tanks is good enough for the effect to be minimal, but you could check for surface films and make sure there's strong rippling on the water surface.

08/29/2014, 07:02 PM
I wouldn't even worry about the pH just maintain your alkalinty consistent.

08/29/2014, 08:42 PM
Wow, I am not there yet... but this is cool stuff.... wife wants corals... as always, a slave.... LOL