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First your going to be ok. Take a deep breath...there now don't you feel better. How long has it been since you last checked your pH and tds? If is been 2-4 hrs then check both again and come back with the reading. Keep your pH reading between 5.5 and 6.2, I'll include a chart to help you out. It also, has a handy feed chart that you should use as a guide.
Now for any further changes follow the following rulee.
Start with a base reading, once you have it wait a few hours and check it again. If the tds level rises you need to immediately lower it. Of course if the oppisite is true then it is lacking in the proper level of nutrients
If the pH level is dropping then you are probably lacking potasium during flowering or you have to much nitrogen or phosporous(as most flowering formulas are low in nitro its more likely the later). On the other hand if your pH is consistently going up you are likely having just the opposite problems.
One last thing tha I do that seems to help aleiviate some problems is add a pinch of epsom salts each time I change the nutrients, as magnesium is nesessary in the uptake of other nutrients, and most ferts just do not have enough for MJ.
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