Quote Originally Posted by Wobster
Any Aquariums will sell ph testing kits both liquid and digital. It costs more but I'd recommend a digital one as you get a prescise reading. The colour liquid indicators are good but if you've added ferts to water or testing the runoff the water isn't always clear in color so the results can be decieving.
ok i'll try to get a digital one today

Quote Originally Posted by Wobster
The pic looks like theres a N deficiency which would be sorted by a mild nuterient solution... however without knowing the ph I wouldn't add anything.

You're using promix which should contain enough nutrients to sustain the plant for a while. How old is the plant? If the ph is out, the nutrients might be in the soil but unavailable to the plant as they are locked out.
shes a few weeks old