What Nutrient Deficiency Causes This? - The Planted Tank Forum
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post #1 of 3 (permalink) Old 10-01-2017, 12:11 AM Thread Starter
Algae Grower
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What Nutrient Deficiency Causes This?

Hi I am quite new to aquascaping. Had lots and lots of different kind of algae blooms and had to cut back on the fertilizer to stop the algae from taking over the tank. Thankfully with many water changes and barely no fertilizers algae bloom is now taken care of. I believe algae bloom was caused by EI method which was just way too much fertilizing. Some of my rotala plants were stunted from growth due to the toxicity of the water. Now all my plants are growing.


few days ago I noticed that the leaves of my plants had some large holes. One of my Anubia plant had a hole, and then from the center it became yellow and now the whole leaf is dying. I know that this is happening because there are some nutrient that the plant needs, but I don't know what it is. Instead of overdosing, I want to dose the nutrients that are not available in water (I guess you can call it a more specialized fertilization plan for my tank). I have attached the photo. Also this is my setup:

65 gallon tank
Light - 128 watt t8 bulbs
Pressurized CO2 - 18 to 30 ppm (4 dKh with 6.8 or 6.6 ph level)
Nitrate - always above 5 ppm

I do not have water testing for Potassium nor Phosphate or any micro nutrients.
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post #2 of 3 (permalink) Old 10-03-2017, 06:35 AM
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Some of ur leaves also have gsa. And the holes could be due to potassium def. Try dosing some kh2po4. R u dosing any kno3

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post #3 of 3 (permalink) Old 10-03-2017, 04:07 PM
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Hi moseschi1,

You didn't state what you are dosing now or how much, only that you used to dose EI and "just way too much fertilizing". I think you have now gone to the other end of the scale, not enough fertilizer. Looking at the pictures I see overall chlorosis (yellowing) of both the new and old leaves including the veins of the leaves; older leaves dying; and it is hard to tell but new leaves appear to be smaller.

Chlorosis general, no interveinal chlorosis. Effects usually general on whole plant.

1. Visible symptoms include yellowing and dying of older leaves. Foliage light green, growth stunted, stems slender, yellow...nitrogen deficiency

Plants receiving enough nitrogen to attain limited growth exhibit deficiency symptoms consisting of a general chlorosis, especially in older leaves. In severe cases, these leaves become completely yellow and then light tan as they die. They frequently fall off the plant in the yellow or tan stage.
I know you may have 5ppm of NO3 in your water column (assuming the test kit has been calibrated and is accurate) but with 4X32 watt T8 lamps and CO2 your plants are going to need nutrients and you seem to be starving them somewhat. On a side note in the last picture I see the leaf margins curling downward. You have 4 dKH do you know what your dGH is? Curling downward (or upward) of leaf margins can indicate a magnesium deficiency.

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