Tap pH lower than tanks

  • We are currently upgrading MFK. thanks! -neo

Irecruitfish

Dovii
MFK Member
Feb 18, 2016
985
368
102
Chicago area
My tap pH is 7.6 and my tank is 8.1. Any reason this is happening? Its decently planted but I have 2 rocks and a drilled piece of slate for the driftwood.

29 gallons.

20170309_203748.jpg
 
I usually do about a 40% water change and it's done weekly. Not sure what kind of rock but I purchased it from a reputable LFS. I put vinegar on it before putting into the tank and no fizzing occured. These rocks have been in the tank for over 2 years now but I recently tested the pH for the first time and was shocked at the #s.
 
Not sure if this picture helps to identify the rocks? My guess is the only thing that can cause a pH spike are the rocks so if need be I'll take them out and do a water change and see how the levels are later in the week. Eco complete is the substrate.

20170313_214235.jpg
 
Usually pH does the opposite in tanks.
But since the blue fish in your pic, looks like a rift lake African, I'm not sure why you are worried about the pH.
The rift lakes can sometimes have pH to almost 9.
If you are worried about pH stability, you just may want to do more frequent, smaller water changes per week.
 
Usually pH does the opposite in tanks.
But since the blue fish in your pic, looks like a rift lake African, I'm not sure why you are worried about the pH.
The rift lakes can sometimes have pH to almost 9.
If you are worried about pH stability, you just may want to do more frequent, smaller water changes per week.
Yup thats a dolphin moori which I'm growing out to put into my 125. The tank its in now is full of south American tetras/zebra dainos. I guess since the fish are fine I'll just not worry about the pH.
 
  • Like
Reactions: GamerChick5567
+1. The rock look like basalt. Non-reactive. It's likely that your tap has some excess dissolved co2, which lowers ph. Once it goes in to the tank, the co2 gets gassed off and ph goes up.
That makes a ton of sense. After a water change there are always a lot of water bubbles everywhere.
 
MonsterFishKeepers.com