Strange pH Issue

[Hopkins]

What in the world is going on in my tank? I am not dosing anything. I did change out a Vortech with 2 Tunze pumps around that time... I don't think the probe is malfunctioning because everything in the tank looks like garbage.

[Hopkins]

I think I turned down my GFO and Carbon reactor around that same time. It is now off... Let's see if this stabilizes everything.

[Hopkins]

http://i68.photobucket.com/albums/i4/hopkinsag1/Cadlights/Capture.png

Only been about an hour, but it has leveled off. Now to deal with the carnage....

[slapshot]

Sorry to hear, but that makes no sense. Hmmmm

[estanoche]

think your GFO or carbon were leaching???

[Hopkins]

And we are back at 11.8 for the past couple hours now. I am at a loss.

[Hopkins]

The only thing that makes sense is a faulty probe. I did do a test with a cheap API pH test and it looks like I am around 7.5-8.

[jimsflies]

So corals look bad too?

Although I don't think stray current should bother corals, I would look into a bad heater possibly a pump. But given how the graph looks it appears it is something being turned on/off.

[Hopkins]

Hmmm... It might be my chiller pump. I cycled power on it and the pH started going back down to normal.

I pulled out a voltmeter, but didn't see any stray voltage. Next time the pH spikes I will test again. This tank has been nothing but a frustration lately.

[slapshot]

That's weird. That would drive me crazy. It's got to be the probe.

[Hopkins]

I think my coral looks bad because I had been using carbon too aggressively. Hopefully taking the reactor offline will help bring nutrients back into the water and save what little coral I have left. What a nightmare.

[Saltwaternoob]

I vote that the ph probe is bad also, do you have any fish?

Because if the ph was swinging that rapidly i would assume they would be dead.