My mangroves are dying. Help me

mangpark

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I can't write English, so I write using a translator. I'm sorry

These mangroves have been raised for more than a year, and since the last four months, yellow spots have formed on the leaves, and the leaves have dried up yellow, and they have started to fall one by one Faster than the growth rate of new leaves.

Water is FW and nitrate is under control.

I've also tried roottap sold by API, but I don't think it's working.

The lighting is 150w and according to the catalog specification, the ramen is about 660ppfd as shown in the picture (100 cm distance)

The flooring material is sand and it is about 30cm deep.

The temperature remains between 25 and 30 degrees.

There's almost no water flow.

The leaves that turn yellow and fall are giving me a hard time Please let me know the solution
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Robo

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I’m not an expert, but my mangrove is in a bare tank and gets water changed out a few times a month and fed a little slow release fertilizer. They perk right up after being fertilized and I’ll watch and give more whenever seeing more yellowing of leaves than usual.

If yours are in a bare tank, without fish, thinking that might be part of problem. Hope it helps.
 
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