What is there that makes ph go up the plants, substate?

PH is at 7.7 now was 7.5 wednesday did water change went down to 7.0.
Always goes up is it excel?

What is your substrate? And, do you have any rocks in the tank? You can leach minerals from some rocks and substrates that raise the KH, which also raises the pH.

Eco-complete and flourite substrates
Rocks granite

Before I changed gravel over to eco-complete and flourite subtrate it was 7.0 -7.1 in fish only tank with the same rocks.

You've already checked to be sure it isn't offgassing of tap water?



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For those that may not know...

Water directly out of the tap will often have an artificially lower PH, caused by the internal water line pressure and Co2 gasses that may be present in the lines. You can often take water from the tap, measure the PH, let the water sit for a day, measure the PH, and record a noticeable difference since the Co2 gas has been given time to escape from the water. In this case, a water change with fresh tap water can cause a temporary PH drop that eventually rises back up to natural levels. If the PH changes occur over a short period, like 24 hours, and then stabilize, this could be the cause.
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It may be the Eco. I have read about it temporarily raising the KH and therefore the pH. It seems to be temporary and only lasts for a few water changes. I've never experienced it myself but I have only used Eco in one tank.

Do you have any white pieces in your Eco Complete?

Most new substratesd will not have a lowering effect on the tank water, as they age, they get sour and more organic matter builds up, the older gravel likely did this, whereas this new gravel, will take some time, the EC sometimes will raise it.
Flourite will not impact pH at all, I've never heard anyone ever say anything about flourite doing anything to the pH/GH/KH.

Regards,
Tom Barr

Increased plant growth due to a better substrate can place a higher demand on CO2, thus causing the pH to rise as well as you mentioned.......

Regards,
Tom Barr

No I made sure I did get the reg. eco-complete not the Eco-Complete African Cichlid Gravel-20l(Carib Sea) that raises the ph.


Tom Barr and all thank you for helping me now what KH should be at and how to keep that number?
Also is there a way to the yeast mix to set it at a point so it not lower the ph so low?

Actually, some of the Eco Complete for planted tanks had some calcium carbonate chunks in it a while ago...or at least what appeared to be calcium carbonate. If I remember correctly, all of their substrates for both freshwater and saltwater are made at the same place and their was some cross contamination....

That is the Eco-Complete African Cichlid Gravel that has calcium carbonate in it that is on there web site.