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Hi.. the same kind of brown patches used to come on my frogbits. I increased the phosphate dosing and now it's gone. Phosphate s something we underdose especially when we have a densely planted tank. I am almost dozing 5 to 6 times the recommended ei phosphate dose now and plants r flourishing. Let's try that for a week and then if symptoms persist or get worse we can c where else the problem might be. Keep us posted.

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Wouldn't calcium deficiency be seen in new leaves as it's a non movable nutrient. And it usually results in stunted small leaves.
In my experience, when I see necrosis on the leaves, I think it’s calcium dificiency. I would dose 1 tsp CaSO4 per 10g just once. Then wait two weeks. You will see the improvement. Don’t forget to continue with your other dosages.
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