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Echinodorus uruguayensis dieback

Gerald Buswell

Gerald Buswell

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Joined
4 Dec 2019
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36
Location
Cape Town
Wondering if any members maybe able to help me with this problem.
I have a five foot tank mainly planted with Echinodorus, all of which seem to be growing well, the tank has been straight forward so far, minimal algae issues etc.
I am however struggling with Echinodorus uruguayensis dying back, see the photos of the leaves, it looks like a deficiency of some sort, which is strange considering the growth of all other plants.
There are a few, perhaps six a Mano shrimp and perhaps six Otocinclus so I don’t think it is leaf damage.
I have inserted root tabs, fertilisation is with Tropica Specialised running through an auto doser.
Any thoughts?
 

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Not sure about this variety, but as most are grown emmersed in the nurserys and it's quite normal for old leafs to go, melt etc and new leafs grow. How long as it been in the aquarium?
 
Well if your other plants are OK just remove any of the affected leaves right down to the base and new healthy growth should rejuvenate the plant
 
Maybe a potassium deficiency. Have you tested your K levels?

Also, what is the plant coming out of the water in the right side of your full tank shot?
 
I don't know if this helps?l researched this plant and there are quite a few variants,, its described as easy ,prefers a cooler temperature and interesting can develop red, brownish leaves and there is a black leaf one. I mention this because all the others are thriving except your uruguayensis
 
Hi all,
Le duke said:
Maybe a potassium deficiency. Have you tested your K levels?
Click to expand...
Gerald Buswell said:
I have actually increased the potassium dosage to 10ml per day from 7ml, I don’t have a test for potassium.
Click to expand...
I'd see what happens, but I don't think it is a potassium (K) issue or that there is any reason to get a test kit.
dw1305 said:
..... I've never been too concerned about potassium (K) levels. I don't see potassium deficiency as a big problem and I'm not an EI user so water changes are always going to deplete its level in my tanks, if I get <"too ad hoc. with its addition">.

Because of the solubility of the potassium (K+) ion , and its mobile nature in the plant, once you add KNO3 etc you should get a pretty quick growth response. It might be that nitrate (NO3-) was <"Liebig's limiting nutrient">, rather than K+, but as plants need a lot of both of them I'm not too bothered about which it was....
Click to expand...
If you were really interested in a value? You could get a <"potassium (K) value from a lab. via ICP">.

If you still wanted a test kit, you need the LaMotte one, from this thread <"Potassium test?">.
........ Sodium tetraphenylboron reacts with potassium to form a white precipitate. The turbidity of the solution is proportional to potassium concentration which is measured in a calibrated tube....
Click to expand...

cheers Darrel
 
thank you for all your responses. I think this plant may been moved to a new genus, so it is possible that the variants will be upgraded. I believe have the variant called ‘africanus’ also growing in the tank and it is healthy. These plants which have narrower leaves seem to be the classic uruguayensis, I am hoping they come right as I envisioned something closer to the plant featured in the old Green Machine cube update video.
 
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