Help with water chemistry PH dropping

[NinjaSeaTurtle]

I have a 70 gallon Red sea max e260 with 20 gallon sump
Ph has dropped to 7.5 and continues to drop
Ammonia, nitrite are at zero and nitrate below 5 test seemed kind of inconclusive
Alkaline is at 10.9
Calcium 400
Magnesium 30
Phosphate 0
I have had the windows open off and on all day and no change.
I have magnesium sulfate, magnesium chloride, calcium chloride and soda ash. With these parameters should I dose any of these to help with my numbers and if so how much?

 

[Randy Holmes-Farley Verified Community Expert]

No matter what the magnesium is, it doesn’t impact pH, but what is it?

The pH is likely to be inaccurate at that level, particularly with windows open.

 

[NinjaSeaTurtle]

Well I have a neptune apex hooked up and it has been as high as 7.6 but this morning it started to drop so I opened windows thinking I needed more fresh air in the house but it is currently reading 7.38. the carpet anemone seems to be really upset today and I'm just worried it's getting too low. So I want to be proactive if there was something I could do to help. I bought the tank a week ago and it came with the livestock. I removed and replaced the sand during the move so I'm sure that is having an affect on the chemistry but if there is something I can do to help the livestock I'd do it. I just dont know what

 

[Randy Holmes-Farley Verified Community Expert]

7.38 is not at all likely to be accurate.

 

[NinjaSeaTurtle]

7.38 is not at all likely to be accurate.

Well that doesn't surprise me at all... I had a heck of a time getting that probe to calibrate. I guess I will just watch everything and if I see other things acting differently I'll have to start trouble shooting.