Ph help

[wiselyy73]

Alk 150ppm
Cal 500
Mag 1250

But ph getting lower and lower from 7.6 to 6.80 now.

Any clue please ?

 

[BoomCorals]

You need more surface agitation for oxygen exchange such as from a skimmer etc I think.

 

[wiselyy73]

My tank is 100 water volume including sump. I have a vertex 150 and two mp40.

 

[vegamedic]

how are you measuring pH? I agree that increasing surface agitation (try pointing your return nozzles more towards the surface of the water) to promote gas exchange is a good first step. Are you dosing anything?

 

[Lasse]

But ph getting lower and lower from 7.6 to 6.80 now.

Can´t be true - if its true - you got problems!!!!

Edit: Is it really the pH you refer to - not the alkalinity (KH)?

Sincerely Lasse

 

[Mrx7899]

When was the last time you calibrate your pH probe.

 

[chris k.]

Maybe you are looking at alk.

 

[markalot]

Stop testing PH, problem solved.

Seriously, if you care about PH make sure you have an accurate probe and it is calibrated using the standard solutions, otherwise just stop testing. The only way to raise PH is to bring in skimmer air from the outside or run the intake through carbon scrubbing media. Any chemical alteration will spike KH and kill most of your corals.

If you typed PH and meant KH then get yourself a good two part solution (BRS, C-Balance, etc) and dose just enough of both parts to keep KH stable where you want it. I like 7.0 KH.

 

[Randy Holmes-Farley Verified Community Expert]

I agree the pH of 6.8 cannot be accurate.

This has more:

pH And The Reef Aquarium
http://www.reefedition.com/ph-and-the-reef-aquarium/

 

[wiselyy73]

I does two parts. Using Apex probe. Last calibrate is about 4 months.

 

[Scorpius]

Your probe is wrong.

 

[Lasse]

If you have this pH in a reef aquarium all of your corals, snails, clams and LS will dissolve. Your aquarium will be a large calcium reactor - your alkanity should hit the 40 KH level and so on. The probe or the calibration is wrong. No doubt. At all.

Sincerely Lasse