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yeah stick with grow big for this grow..... that is what you used in veg right? and if I remember correctly you are using Happy Frog with ammendments? 10-2-1..... and what nutrient is that (the bat guano? Definitely more than you need using alongside the other FF products) a nutrients source materials, source materials locations, and processing/storage methods are what make the biggest difference in whether or not you should use it, or especially mix it with other nutrients. Stick with the FF for now instead of the guano..... make sure your water quality and media temps/moisture/oxygen/ph levels are where they should be..... I have noticed that after approximately 6-8 weeks of use, most soils and even coco or other media need a little doctoring, or a little extra care in maintenance, because the roots truly eat away the media, breaks down and changes the soil composition, and plays a part in adjusting the oxygen:moisture:biological activity ratios, it sucks up micro nutrients in ratio to macro nutrients a bit faster from week 4 to week 7 in flower, and still requires a well balance mineral content (both active and inactive)..... as the roots "work" or "eat" at the media, these mineral levels change (in ratio to other present media/compound molecules), the microbiological environment also changes due to mineral fluctuations, water quality content and temperature etc. fluctuations, chemical introductions via FF nutrient products and biological biproducts, and ph fluctuations from area to area of media/soil..... this allows for the rather unfortunate event of salts from the FF nutrients being allowed to somewhat solidify or "clump up" as the media dries creating unhealthy salt deposits, and other imbalances in the media..... like I said, doctoring....
Using a LIGHT flushing technique followed by an application of Fox Farms Big Bloom plays a big part in this doctoring...... as well as organic based Cal Mag enhancers and/or micro blast, while skipping a normal macro nutrient feeding to allow for the actual balancing to occur, and feeding with an instant soluble such as Bio Bizz Bloom the watering after instead, to insure that the microboilogical environment has enough food to stabalize itself while still providing enough for the plant after LIGHTLY flushing out some of the salt build up.... This means that there is a ratio of media to water to nutrient concentration (or amount) added to mixture level (including oxygenization) that has to be in a certain balance area in order to provide for a truly healthy root uptake environment, without stimulating excessive root growth (we are talking about flowering here
)........ hope this hasn't been too difficult to sort through..... hope it helps...... I am not saying you should necessarily do Anything in particular, but I am saying that keeping these things in mind while making your decisions in what to do will make a difference...... as I honestly haven't followed your grow close enough to say for sure, and even then, you are THERE, not me......