Help first time grower and having issues

I am growing indoor obviously under 120w of fluorescents mix of soft white and full spectrums. ph is at 6 from what i can tell. Had been watering with tap water until last week and got some distilled water. Growing in mg for african violets(have since read this is not ideal, have no other alternative right now). I only gave nutes one time it was food booster flower food by mg. the symptoms looked like nute burn at first but have been spreading without anymore feeding. It seems to be affecting the older leaves and working its way up the plant. I water 1 1/2 cups every day. Unfortunately dont know the relative humidity, or exact temp. any help of insight would be greatly appreciated, thanks ahead of time!!
 
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