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I have a 90 gallon. I water change 2 times a week at 30%. I usually add my ferts after the water change. Going by the dosing schedule on the back which says add 5-15ml per 30 gallons once to three times a week. This is for the Pro Plant and Freshwater Plant. I have 324 watts of t5ho and 2 bbs with pressurized CO2. With this being a high tec setup in my opinion, should i be dosing the max dose of 45 ml of each after my water changes 2 times a week? Some of my more difficult plants include HC, L. Aromatica.
 

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I would say you need to dose more than twice a week, other than just after water changes. Not sure what the two ferts contain that you are dosing, but make sure you are dosing nitrates,phosphates,potassium & micros.
 
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