<a href=showthread.php?s=&postid=10227701#post10227701 target=_blank>Originally posted</a> by sir_dudeguy
Dont add anything yet. We need to make sure that there arent any obvious problems causing it first. It would be bad to dose something otherwise.
Do you have a tight lid on the tank? If so, its not allowing for gas exchange, which lowers pH.
Do you have good surface agitation? If not...same thing...
Take a glass of tank water and put it outside with a bubbler/airstone in it...test it again after an hour or so and if its higher, then you have an indoor co2 problem and need to open windows occasionally