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Old 01-29-2013, 06:06 AM   #1
Planted Tank Obsessed
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Default How to tell deficiency

Ok so instead of going the dry ferts route I got flourish instead. I'm gonna dose half of what they say to use to start since its a low tech tank and I want slow steady growth BUT my question is how do I know what I need? I don't know what minerals and stuff are already in my city water. I bought NPK and trace from seachem but if I have as an example potassium in my water Already I don't wanna overdose. I've tried contacting my BPW but can't get through to the right people. Any fool proof way to tell if I need all 4 things? Planning on dosing once a week
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