1s grow and starting to get some brown spots just wanted a second opinion as im not sure. Thanks :)

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Dutch passion blueberry auto. Week4-5. Canna terra soil. One feed of terra vega at 2 weeks (now know i shouldn't have done that) watering every 3-4days with 6.2ph bottled water now. Way over did the water at beginning. Temps are 24-26c day and about 18c at night. Rh around 45% most of the time usually dips not rises. 600w hps running at 250w as I only have a small tent and even 400 raises the temps to over 30. Umm I think that's it. Thanks for any advice :) happy new year!!
 

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Dutch passion blueberry auto. Week4-5. Canna terra soil. One feed of terra vega at 2 weeks (now know i shouldn't have done that) watering every 3-4days with 6.2ph bottled water now. Way over did the water at beginning. Temps are 24-26c day and about 18c at night. Rh around 45% most of the time usually dips not rises. 600w hps running at 250w as I only have a small tent and even 400 raises the temps to over 30. Umm I think that's it. Thanks for any advice :) happy new year!!
It looks like more than 1 thing going on here my gess would be a mag deficiency but a few things can cause that this is a good read https://www.nofa.org/soil/html/magnesium.php
 
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