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Wow, I did not realize Mg could be locked out that easily thank you both for telling me. What I have right now is a pH test and adjuster kit for aquariums. There is a bottle of test solution, a bottle of pH up, and a bottle of pH down and the range of the test is 6.0-7.6. Is there anything...

Thanks a ton for the replies. Magnesium deficiency is what I suspected. What's the best way to treat this? I have read that salts accumulating in the soil can cause other problems, so I'm a little nervous about watering with epsom salt solution. I have been spraying with a 1/2 tsp per quart, is...

Hey guys, I am a first time grower trying to find the source of some issues I am seeing in my plants. These plants are about two months old. They were in 16oz plastic cups as seedlings, first under sunlight and then under a CFL bulb. They are now in ~5 gallon pots and under a 600w HPS. They...