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Greetings, facing the problem of dissolving lagenandra leaves. Maybe someone knows how this problem is, thanks in advance. Aquarium 300 liters, osmosis, replacement 78 liters. I add Ca-22.43 ppm, Mg-8.97 ppm to the displacement water. Macro per week: K-24 ppm, NO3-35 ppm, PO4-8.5 ppm. Degassed Ph-7.6, reduced to 7.0. Lighting MG-300 W, daylight hours 7 hours.

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Looks like you have too much light. I'm not sure how you can reduce the intensity of light, but reducing light will improve the plant growth. Cut of the damaged lagenandra leaves including the stalk as close to the substrate as possible. these Plants grow along the edges of hill streams and like flowing water and cooler temperatures.
 

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There is such a thing called too much light. One advantage after procuring a par meter ;-) My friend had bad growth of plants, and he continued to add more light. After we finally measured the intensity and reduced the lights the plants grew very well. Reducing the duration of light will not help much when the intensity is so high. I would suggest to use one MH lamp instead of three. One 150 watt MH is sufficient light for this tank.

I think this is a 90X45X45 cm tank?
 
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