Plant only filtration (why not popular in the hobby???)

Rivermud

Candiru
MFK Member
Dec 14, 2007
980
14
48
Idaho
Quick update:

The Verbena and Sweet Potato plants have really taken off. Each day I see up to 6 inches of growth. The house palm that was nearly dea has shot out 6 new leaves and forced me to raise my lighting twice now. Early on I had an issue with low iron levels, it didn't seem to affect the house plants nearly as much as the outdoor plants. I did get it addressed with chelated iron though now i am doing a weekly dosing of a product called Thrive from Zamzows. It is marketed as a micro and macro supplement to feed your plants. I've used it many time one outdoor plantings and they all were very healthy afterward. This is semi experimental as they have never tested it in aquaponics though it is organic and non toxic.

20150609_144926.jpg

Here is them shortly after planting.



The fish seem to be doing great, they've grown faster than any fish I've owned. Several have crept past the 4 inch mark and are growing fast.. funny enough i still have one or 2 that seem to not grow at all.

20150609_145658.jpg


I do believe i need a much denser planting. some plants are doing great, others, not so much. The Lemon Balm initially took off then suffered from a lack of iron, I chopped it back and it has started to grow back but the leaves don't seem healthy as they show similar issues as when they died. The 2 Philodendroms have grown decently enough, Im sure its due to growing a root structure before developing leaves. I planted cress from seeds and its growing fantastic, I could harvest a full salad right now. Lastly, the Alyssum is hit and miss. 1 died, 3 are healthy and slowly growing, 2 are alive and thats about all I can say for them. The sweet potato has basically shaded the green onions, if any survive I'll be surprised.
 

souzie

Peacock Bass
MFK Member
May 13, 2014
746
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Ontario, Canada
Okay, I have a question...

Why do my pothos keep dying? I have the roots in the water which is fine but the leaves keep turning yellow and drying up. Like I have to keep replacing them a few months or so.

What gives? o_O
 

Yuki Rihwa

Redtail Catfish
MFK Member
Jan 22, 2015
2,596
1,432
154
Asia
Okay, I have a question...

Why do my pothos keep dying? I have the roots in the water which is fine but the leaves keep turning yellow and drying up. Like I have to keep replacing them a few months or so.

What gives? o_O
Pothos impossible to kill if you have water and light to feed it...if your pothos dieing after months then I'm pretty sure you're lacking light for it on your Black Water Pirahna setup. Also, might be check how soft your water and PH too. the picture is my 3 years old pothos :) the plants body base diameter close to 0.5 inches on some branches...see the leaft? it's 6 inches wide and 8 inches long! I divided it many time for other tanks too.
June09-2015.JPG
 

Rivermud

Candiru
MFK Member
Dec 14, 2007
980
14
48
Idaho
Actually what is being described sounds like an iron deficiency to me. I already suffered through it in my system. I am on a wee bit bigger scale but the symptoms are a yellowing of the leaf followed by drying and browning. The vein of the leaf will be gree but the rest will be yellow.



that might be similar to what you are seeing with your plants. If so you might try dosing iron. Let me know and i will try to help as best I can.
 

Pomatomus

Piranha
MFK Member
Jul 7, 2009
1,691
162
81
Sarasota, FL
Traditional filters aren't used to remove nitrates, they are used to remove waste that would later become nitrates and increase turbidity. From a chemical standpoint what you are doing is fine, but for aesthetic purposes people like to remove debris through filtration as opposed to letting it settle on the bottom. Aeration is another factor, but you're running a pump for that. So I would ask, why run a pump when it could be removing waste as well?

But your observation is correct. This is why I don't freak out about cleaning my filters on schedule. If the flow is good then there is really nothing to worry about. Nitrification can be achieved by having enough gravel/surface area and denitrification can actually be achieved by having anoxic zones or plants. I saw a thesis presentation a few years ago that found through mass-balance that more denitrification occurred from the bacteria around the roots than by the plants themselves! Your "dirt" is probably doing more than your plants but I suppose it depends on the plants.
 
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souzie

Peacock Bass
MFK Member
May 13, 2014
746
617
115
Ontario, Canada
Pothos impossible to kill if you have water and light to feed it...if your pothos dieing after months then I'm pretty sure you're lacking light for it on your Black Water Pirahna setup. Also, might be check how soft your water and PH too. the picture is my 3 years old pothos :) the plants body base diameter close to 0.5 inches on some branches...see the leaft? it's 6 inches wide and 8 inches long! I divided it many time for other tanks too.
View attachment 1125742
Hi Yuki,

I've read that pothos grow fine in medium to low light which is why I chose them...because my p's hate bright light.

My ph is 7.2. Ph coming out of the tap is around 7.8.
 

souzie

Peacock Bass
MFK Member
May 13, 2014
746
617
115
Ontario, Canada
Actually what is being described sounds like an iron deficiency to me. I already suffered through it in my system. I am on a wee bit bigger scale but the symptoms are a yellowing of the leaf followed by drying and browning. The vein of the leaf will be gree but the rest will be yellow.



that might be similar to what you are seeing with your plants. If so you might try dosing iron. Let me know and i will try to help as best I can.
Here's my measly bunch of pothos. Last month, I had double that amount and the month before that, almost triple.

p.jpg p1.jpg

Kind of looks like what you're describing. So how do we dose with iron?
 

Rivermud

Candiru
MFK Member
Dec 14, 2007
980
14
48
Idaho
Traditional filters aren't used to remove nitrates, they are used to remove waste that would later become nitrates and increase turbidity. From a chemical standpoint what you are doing is fine, but for aesthetic purposes people like to remove debris through filtration as opposed to letting it settle on the bottom. Aeration is another factor, but you're running a pump for that. So I would ask, why run a pump when it could be removing waste as well?

But your observation is correct. This is why I don't freak out about cleaning my filters on schedule. If the flow is good then there is really nothing to worry about. Nitrification can be achieved by having enough gravel/surface area and denitrification can actually be achieved by having anoxic zones or plants. I saw a thesis presentation a few years ago that found through mass-balance that more denitrification occurred from the bacteria around the roots than by the plants themselves! Your "dirt" is probably doing more than your plants but I suppose it depends on the plants.
The denitrification occurs at the roots because they are what is used to feed the plant itself. Nitrogen is the base chemical used for plant growth, the absences of it and plants do not grow. The bacteria work in a symbiotic relationship with the plant.

"The symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they multiply and stimulate formation of root nodules, enlargements of plant cells and bacteria in intimate association. Within the nodules the bacteria convert free nitrogen toammonia, which the host plant utilizes for its development. To ensure sufficient nodule formation and optimum growth of legumes (e.g., alfalfa, beans, clovers, peas, soybeans), seeds are usually inoculated with commercial cultures of appropriate Rhizobium species, especially in soils poor or lacking in the required bacterium."
 

Rivermud

Candiru
MFK Member
Dec 14, 2007
980
14
48
Idaho
Here's my measly bunch of pothos. Last month, I had double that amount and the month before that, almost triple.

View attachment 1125784 View attachment 1125785

Kind of looks like what you're describing. So how do we dose with iron?
Are all of your new leaves turning Yellow or is old growth turning yellow? The distinction is important because certain deficiencies look similar but occur differently. For example, iron deficiency shows on new growth. Magnesium on old growth.
 
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