Okay, for a start..is it heavily planted? Plant heavily and I mean it..it would help you avoid much problems. Start your DIY CO2 as soon as possible and then test whether the proportion of sugar to yeast is good for adequate CO2 production. (You will need a KH test kit and pH test kit or test pen for finding the CO2 level). After doing the CO2 thingy..you can then come back for more info on nutrient dosing. []
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