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ShepherdReefer

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Looking to see what others think about the Apex Neptune PH probe vs. other PH test equipment? I keep getting low PH levels (calibrated) alarms with the Apex system like around 7.6 but when using the Hanna PH tester I get a higher reading and when using the RedSea PH test unit, the PH is still higher around 8.1. It seems the corals are not growing but look healthy. I know the PH can have a big part of the coral growth and was wondering if the Apex PH probe correct...possible using other parameters to calculate the PH measurement.

- Some say to open a window - I usually have the back door open (which is located 4' from the tank).
- Some say to run the skimmer air tube to the outdoors, such as through a window. I think this is a bad idea. When the pet control companies come to spray, the skimmer will consume the spay into the tank from the air tube.
- Alk 8.0-8.5, Ca 420-450, Mg 1300-1310, Salt 35, ORP 410-450, & temp 77-78.
 
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vetteguy53081

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Mine has been fairly accurate but I do have as a backup - Pinpoint ph unit which seems to be darn good.
 

redfishbluefish

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Where is the probe located compared to other electrical equipment. pH probes could be effected by electrical interference. Try taking tank water in a cup, away from the tank, and see what pH you get. Or try measuring pH at different locations within the tank.
 
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ShepherdReefer

ShepherdReefer

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Hey guys, good questions. The last time I calibrated the probe...last week. The probe is located in the compartment after the sock filter just before the skimmer. I could move the PH probe to the next compartment but if the probe is affected by electrical interference, then that compartment will be a bad idea, it has two other pumps. One for the carbon canister and another pump for the UV. I don't have any other place to place the probe. I could take the tank water in a cup and see if the reading is the same...I will try it.
 
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iggy

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I meter saturated kalk at 2 liters a day so pH should be rather predicatble. I found the Apex reading drifted down over 2 months while corrals are growing.

I am contemplating a second pH probe eventually. It is only measurement I lose confidence in. ACI on ReefBum youtube channel had an interesting video on importance of chasing pH. I tend to agree mostly.
 
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