Is it just the leaves directly under the light turning yellow, or are the leaves lower down on the plant turning yellow too? If it's just the leaves under the light, is it possible it's being caused by light burn?
If not, pH is definitely the first place to look if you start seeing deficiencies. Even in organic composted soil, sometimes you need to adjust the pH if the pH of your water is too high or too low. In a soil setup you want to make sure the pH is between 6-7 for the best results.
Just curious, how long have you been using TopMax? Did anything different happen right before you started seeing the yellow leaves?
If not, pH is definitely the first place to look if you start seeing deficiencies. Even in organic composted soil, sometimes you need to adjust the pH if the pH of your water is too high or too low. In a soil setup you want to make sure the pH is between 6-7 for the best results.
Just curious, how long have you been using TopMax? Did anything different happen right before you started seeing the yellow leaves?
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