水草情迷

my tank ph alway turn to 7.x when i close the co2 and turn off light~~
what can i do for it??>??
i already put some ''PEAT PLATES'' in the fillter ga la..but ph still high!!!!
help

which substrate you are using now !??
if using 荷蘭沙, it may raise your KH and the PH is difficult to lower...
please check it..

but iam useing ada black soil wa~~~
that why i dont know~~~
so now i keep open co2~~~

you also need to check your KH level...
if over 5 , it is difficult to lower the ph too

how to make KH low ???

the old and cheap method is change water with boiled water or distilled water.

below web site have detailed explaination.
http://www.aqualink.com/columns/k-layt7.html
http://www.drhelm.com/aquarium/chemistry.html