ph rise

[raymond.1963]

why would my ph rise did my weekly check this morning normally at 7.4 has gone up to 8.6 what would cause this

 

[steez]

Some types of rock and other ornaments inside the tank can raise the pH.

 

[raymond.1963]

my ornaments have been in all the time ph has been steady only thing changed recently is that last week i introduced a co2 defuser which is plastic mmmm

 

[jlk]

I would ask this question in the fw 'planted tanks' forum because you will get a better response. I dont fully understand the process but there is something called 'biogenic decalcification' which relates to GH & KH and your co2 system and how your plants utilize everything and the end result is a big jump in ph. I believe it has something to do with specific plant species & their production of carbonate. Someone with more plant & co2 experience will be able to explain whats going on (im still learning!)!! Good luck!