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Premium Member
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Discussion Starter · #1 ·
Hello everyone,
A couple of my plants have some leaves turning translucent as you can see from the pictures below (I circled the spots in am talking about in red):





And that happened in less than 24 hours.

Some info about my tank and dosing regime:

1. 75gl tank
2. Wet/dry filter
3. EI fertilization.
4. Pressurized Co2, PH drop of 1.44 (from PH 7.4 to 5.96)
5. 5x40w fluorescent T8 lights 8 hours a day, PAR at the substrate 50-60 PAR.
6. Water change: 50% once a week.

Let me know if I forgot anything. The affected stem and leaves you see in the picture are a little bit in the shadow, so I have no idea if that's the cause of the problem... I haven't done anything since my last water change 3 days ago, with the only exception of increasing Co2 a little bit since I am trying to get rid of some little algae here and there on my plant leaves.

I will be waiting for your thoughts, thanks!
 

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Plant Whisperer
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2,550 Posts
I have seen something similar to this before twice though I am not sure if it is a nutrient issue or is related to something else in the tank. There was some thought that it might have been a micro deficiency, specifically a lack of zinc. Though it might also be a toxicity of some kind.

See this thread: http://www.aquaticplantcentral.com/forumapc/plant-deficiencies/89865-rotala-sp-woes.html

As far as nutrients go, if it was a nutrient deficiency we can rule out some nutrients. The damage appears on the new and older growth.

Nutrients that affect new growth: Ca, Fe, B, Ni and Mn
Nutrients that affect old growth: N, P, K, and Mg.
Nutrients that affect new and old growth: Cu, Zn, S, and Mo.

Of these, I doubt it is Ca, Fe, or B and definitely not Ni. It is not N, P, K or Mg.

This leaves Mn, Cu, Zn, S and Mo as likely candidates. Though S seems unlikely because that shows up as general uniform yellowing not clear cells like that.

Can you take more photos of the leaves? Try get super clear pictures of them.

What are you adding for micros at the moment?
 

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Premium Member
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Discussion Starter · #4 ·
Thank you Zapins,
Here is a better picture for you:



Also, some of the Rotalas at the top have reduced size growth at their tips as you can see from these pictures (sorry, they are a little bit blurred):





This last one has also some holes, despite that could be some drops of hydrogen peroxide I used for some algae on the last water change day... So, please, don't consider those holes since that's the only stem having them.


Finally, answering your question about micros, I dose Plantex CSM + B as EI dosing for a 75gl tank.

I will wait for your thoughts... Thanks!
 

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Premium Member
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Discussion Starter · #7 ·
I use a DIY pre-mixed solution with a 500ml container. I have calculated the amount of Plantex to add to the 500ml bottle by using the rota.la calculator for my tank size (75gl) and the estimative index. I added about 217 gr of Plantex to 500ml of distiller water, and I dose 5ml every other day (alternated with macros.)

I dose as traditional EI: macros and micros on alternating days, starting on WC day (macros) and resting (no ferts) the day before WC (50-60%)

I must say though that my plants are not growing perfectly, some are ok, others are suffering, so maybe many nutrients build-up... I also have a little algae here and there, look at this video about my tank algae situation taken 1 week ago:

http://youtu.be/PJEhgMuSXqw

I am slowly trying to increase Co2 as much as I can, I have already reached a PH drop of 1.44 without noticing any appreciable improvement. I have a big wet/dry filter that degas a lot, so fish are still ok, but I want to try to maximize my Co2 to reach the max I can to rule that out and eventually try something else... This would be my plan.

Thoughts?
 

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Plant Whisperer
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2,550 Posts
Possibly, it does look like there might be some pleco damage on the alternantheria but I didn't get a good look in the video. Though the damage on the rotala and hygro doesn't look like pleco damage exactly since the cells are still intact on the leaves and not missing.
 

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Premium Member
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Discussion Starter · #14 ·
Do you mean the possibility of a micros deficiency? No, I have kept dosing at the suggested dose. Do you think that could be a micro deficiency of some sort?

Here is a picture of the Alternantheras, they have some algae on the leaves:



Alternanthera are the worst ones in my tank, and are struggling, no idea why.

I am eager to know your thoughts. Thanks!
 

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Plant Whisperer
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2,550 Posts
I have seen something similar to this before twice though I am not sure if it is a nutrient issue or is related to something else in the tank. There was some thought that it might have been a micro deficiency, specifically a lack of zinc. Though it might also be a toxicity of some kind.
As I mentioned above, the specific cause of this problem is not known. There was some discussion before that it might have been a lack of zinc or another micro nutrient. Though the answer to this was not 100% figured out and the cause is still unknown.

How much of each fertilizer are you adding and how often? You mentioned "Recommended levels," but many people recommend different levels and it is hard to infer how much you are actually adding from this.

What is the water temperature?
 

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Premium Member
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Discussion Starter · #17 ·
As I mentioned above, the specific cause of this problem is not known. There was some discussion before that it might have been a lack of zinc or another micro nutrient. Though the answer to this was not 100% figured out and the cause is still unknown.

How much of each fertilizer are you adding and how often? You mentioned "Recommended levels," but many people recommend different levels and it is hard to infer how much you are actually adding from this.

What is the water temperature?
Zapins,
For the micro, here is what I wrote above:

Using rota.la calculator, I made a pre-mixed solution with a 500ml container. I have calculated the amount of Plantex to add to the 500ml bottle by using the rota.la calculator for my tank size (75gl) and the estimative index. I added about 217 gr of Plantex to 500ml of distiller water, and I dose 5ml every other day (alternated with macros.)

For macros, I also used rota.la to calculate the dry dosing for a 75gl tank.

Here are the values:

Kno3: 3.5 grams
Kh2po4: 528mg

Temperature in these days is around 80-81.
 

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Discussion Starter · #20 ·
Yes, I have 4 bushy nose plecos. I know they may have damaged some of the leaves, but the overall health of some of my plants we are talking about here is due to something else... Their growth is stunted in some way, nothing to do with plecos. I am eager to know your thoughts.

Thanks!
 
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