Ph Difference ,2x tanks same water supply

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stevenjohn21

Gambusia
MFK Member
Jan 17, 2012
125
0
16
Atlanta
Sorry in advance for the long post ....
I have two tanks, 125 gallon community tank with cork bark as decor and a 75 gallon RD tank with one piece of driftwood. Both are filled with tap water from the same supply.
I moved my male and female convict into the 75 gallon from the 125 because they are about to breed and i would like to keep the fry this time. They have been there for 24 hours and i noticed the male this morning has small white dots over his body and fins which im guessing is ich. I tested the tanks water from both 125 & 75 and straight away i realised why. The 125 gallon is reading 7.4Ph and the 75 gallon is reading 6.4Ph ! I tested my tap water and thats reading 7.4Ph.
How can two tanks from the same water supply be so far apart ?

Both tanks have been up and running for almost a year now and to be honest i gave up checking water params a few months ago due to them being fine everytime i checked, it seemed like a waste of time so i cant tell you how long the water has been like this as it doesnt seem to have effected the RD.

Also just to add, i tested the Nitrate, Nitrite & Ammonia levels and they are all ok and match each others results.
 
welli just did a 50% water change and its helped slightly as the reading is now up to 7.0Ph but im sure whatever is causing it to alter will do so in the next few days. Any ideas ?
 
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