PH suddenly at 7.0

[AmherstReef]

Normally I check my PH every day or too , but I probably haven't checked it in 4-5 days and all of a sudden it's at 7.0 when its normally its 8.2-8.4

I run Kalk on a normal basis in my ato and have made no changes recently. The only real changes in the past 4-5 days is that we have shut our windows but a 1.2-1.4 drop is a lot

I have checked with both a test kit and hand held monitor and strangely enough the corals look fine currently have nice PE on my SPS

 

[spinoleo]

what are your cal and alc readings?

 

[AmherstReef]

Cal is 460 and alk is 9.0

 

[NirvanaFan]

http://reefkeeping.com/issues/2004-09/rhf/index.php

 

[spinoleo]

are you dosing anything other than cal and alk?

 

[AmherstReef]

Only dosing Kalk in ATO

 

[SkiFletch]

Well, either your pH probe is broken or un-calibrated, OR you live in one of those "green" houses that are painfully well sealed

 

[tmz]

I don't think 7.0 is possible with those alk nos. There is no way the water is nuetral. Something is up with the testing . Coral skeleton starts to dissove at 7.7 btw.

 

[AmherstReef]

Tested again this morning with the PH meter after recalibrating and it still read 7.0

Retested with a kit and it showed 8.2. Whew!!!

I think what happen last night is in my panic I only added 4 drops instead if 5 with the API kit.

Definitely something wrong with my handheld ,maybe a bad sensor ?

 

[SkiFletch]

It's more often the sensor than the tronics

 

[AmherstReef]

I bought it used from a fellow reefer , probably out if warranty, it's an HM, I'll probably just get a new sensor, I think they $20-$30