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CO2 for all planted aquariums?

Not exactly. All aquatic plants assimilate nutrients via roots and leaves; different nutrients are taken up by the leaves than what the roots take up. Plants that have extensive root systems are heavy feeders, so tabs help them. The liquid nutrients added to the water will obviously get down in the substrate, but for these heavy feeders using the substrate tab is like a boost of energy for these plants, and it does result in more lush and rapid growth.

Stem plants produce roots and leaves from the nodes along the stem, so they are not in special benefit from tabs. Floating plants and those like Anubias, mosses and Java Fern also gain nothing from substrate tabs because their roots and leaves are in the water column.



This is an interesting plant, and it is good to see they have the correct name for the species. Phylogenetic aqnalysis has shown that this species contains the plants from several former "species," namely Echinodorus amazonicus, Echinodorus amazonicus var. parviflorus, Echinodorus amphibius, Echinodorus bleherae, Echinodorus eglandulosus, Echinodorus gracilis, Echinodorus grisebachii var. minor, and Echinodorus parviflorus. All of these former "species" were incorrectly described without the benefit of cladistic analysis. However, an interesting thing is that these "species" had differing growth habits. This extends into the aquarium plants too. Echinodorus bleherae was the most common sword plant in the hobby, but it grows to different heights depending upon conditions. I have seen this in my tanks many times. In the larger tanks it could reach 20+ inches, whereas adventitious plants removed from the inflorescence of one of these plants would grow to a third of that length, or half. Some data from my online profile of this plant:

Description (for the “Bleherae” variety)
One of the most common aquarium species of sword plants and one of the most hardy and beautiful. Mid-green leaves numbering anywhere up to 30 arise from the crown and grow out in a fan formation to a length of up to 50 cm (20 inches) or more with the blade lanceolate and acute at both ends. Will often grow to the surface, so in larger tanks the plant will generally develop much larger in height if provided with adequate fertilization. A deep substrate is needed (minimum 3-4 inches); the root system is large, and will spread vertically and horizontally through the substrate far from the plant.​

The differences in appearance between these plants mentioned above are apparent and seem dependent on the specific environment in the aquarium; this seems likely to also occur in nature, what can be termed transitional forms of the species. But the limited genetic variation within the complex is insufficient to establish reasonable groupings (Lehtonen & Falck, 2011).
Very informative!! Thank you very much!

What do you recommend me doing with all the plants then? Do you think they'll do ok or did I make a bad choice?
 
Very informative!! Thank you very much!

What do you recommend me doing with all the plants then? Do you think they'll do ok or did I make a bad choice?

I just think there are a lot of plants for 1 40g tank. But see which ones do well, some may not. I've tried many plants over the years, and some--primarily stem plants--never did well because my light was moderate for the fish. But those that did well, like swords and usually crypts, I kept and they propagated. Floaters tend to do well usually.
 
I have used the little jar - sugar and yeast - CO2 generators now and then. But I don't now, I feed the fish, I do give some trace to the youngest planted tank but no nitrogen, and no CO2. Light has to be right and patience is a virtue. I grow anubias and crypts, nothing fancy I do put a root tab in the crypt root area every couple of months
 
I just think there are a lot of plants for 1 40g tank. But see which ones do well, some may not. I've tried many plants over the years, and some--primarily stem plants--never did well because my light was moderate for the fish. But those that did well, like swords and usually crypts, I kept and they propagated. Floaters tend to do well usually.
I REALLY want my lotus plants, crypts, red root floaters, salvinia, and swords to do well... And if my ludwigia does well that would be really cool! I got the ludwiga just to see how they would do to be honest... Kinda an impulse buy for those ones to be fair 😅
I really hope all my plants do well!! If my vals start dying off, I'll plant them in my QT tank.
 
Those are for terrestrial plants. I tried some years ago, the little granules never dissolve and I am still picking them out of my substrate - years after they stopped doing anything, yes they did work as fertiliser. Others have not been so lucky and at least one member has reported losing fish after using them- possibly @AdoraBelle Dearheart (???)

Yes... I bought cheap, no brand name Chinese root tabs from Amazon, and instantly regretted it. I added them to a very stable tank, they immediately released far too much nitrogen(?) or something, because my nitrites immediately began spiking into incredibly dangerous levels. Heavily planted tank that had been stable until I added those cheap root tabs. I had to do huge, 75-80% water changes twice a day while combing through the sand to try to remove all these tiny balls of "fertiliser" (who knows what was really in it?) because the outer capsules dissolve quickly, leaving all these bright yellow tiny balls that I had to remove as many as I could by hand.

I still find the odd one in that sand now and then, years later, and it took about two weeks and a lot of work to get the tank stable again, and yes, I lost some fish, including one of my favourite females. I have a thread here somewhere where people helped me through it at the time.

I always urge people to stick with brand name root tabs, so the ingredients are known to be safe. Spend a bit more, and save yourself a nightmare, it's not worth the risk to buy dodgy unknown things like that to put in your tank. You only need to add root tabs every 2-3 months, so it's really not that expensive to stick with a brand like Seachem, NTL, Fluval, Tetra etc. I used the Tetra root tabs for a long time since they're a cheaper brand name, and plants still did really well (see pic!). I use Seachem now, but Tetra root tabs are inexpensive and perfectly fine.

DSCF5597.JPG
 
I have done planted tanks no for about 21 years. I have done low light easy plants, moderate light with a bit more demanding plants and one tanks using pressurized C02. So lets start with talking about supplementing CO2 and why or why not this may be needed.

Almost everything the plants get in a tank is determined by us. Even when it comes to fostering gas exchange between the water and the air, a natural phenomenon, we can influence it. However, everything that the plants need is determined by them. So, what this means is that our plants will do best when we supply what they need and that we remove what they don not so it doesn't accumulate (i,e, water changes).

There are other variables involved, such as what critters we keep what plants we choose and what equipment we have for keeping the tank healthy. But when it comes to CO2, things are pretty simple to understand. There is naturally CO2, as well as other gasses, dissolved in the water in our tanks. When there is not enough of either of these, issues will ensue.

Drilling down into CO2, the issues is how much do the plants require and then, how much is naturally present in the water. As long as the plants do not use the CO2 faster than it can be replaced from surface agitation. There are some simple guidelines one can use based on a couple of consideration re plant load.

The forst is the type of plants we want to have. In this respect we assess how demanding any plant species is. Faster growing plants use more nutrients than ones which grow slowly. Some plants need more light and ferts than others. So we can select our plants by considering this aspect. The more demanding a given plant, the more nutrients and light it needs and that also means the faster it will use these things and this includes CO2.

Next, there is the total plant mass that must be considered. The more plants, of any type, we put into a tank, the more total nutrients. light and CO2 they will need. So, a tank heavily planted with easy care, low light demanding plants can still benefit or even need extra CO2 or a CO2 alternative. The same applies to what sort of ferts and how often they need to be added.

The best part about all of this is planted tanks have been very popular in the hobby and increasingly so in the past 20+ years. So we can research the plants before we buy. We can know what their specific needs are which should help us to select the plants for which we will know how to care before we get them. If we choose to buy the most demanding plants, then they will require the most care. But if we choose the easy to care for species and only plant moderately, we can have great results with little effort. The plants can often get everything they need without much addition input by us.

There is a final component here. When we plan out a planted we make out plant selection. If we do this merely based solely on how a plant looks rather than its need, we will can end up with a mismatch. It is easy to get leggy plants, or plants that shade each other which may mean some plants do not get enough light.

Keeping live plants is not much different than keeping the fish. We need to choses ones which can thrive in our water parameters. We need to feed them the proper nutrition etc. So the trick to this all is do your homework first. Then talk to peole who have actually done it and succeeded. Bear in mind that there is more misinformation on the net than there is good advuice. So you need to go wfor good answers. Wile it is not he most comprehensive source, it is one of the best, imo, is the Tropica site. It is available in a couple of languages, here is the link to the English language version http://tropica.com/en/

I would remind folks that Tropica sells plants and products for their care. This is true of many sites. My advice is to pay attention to the factual parts and do not assume you must use only Tropica products to succeed. Our juob is to find the products that work well for us and then to use them. To that end I can report the following.

We all love to save money. Most of us in the hobby also know that we can buy a bale of peat from our local plant nursery for a few dollars. Or we can buy a tiny box of it marketed for aquarium use for many times the price. The same applies to a lot of the items we use for out plants. I have been fertilizing the substrate since I began keeping planted tanks using Jobes Spikes for lush ferns and palms. They work great and are so cheap it is almost a sin. They can be cut into any size needed, are easy to push into the sunbstrate and I replace them every 3 months or so. But I normally let the plants show me when they need more. My guess is I have spent about $20 over 21 years on substrate ferts. There is only one caveat if you use them. If you uproot them because you rescape often, then you will very quickly earn your MBA (Mastered By Algae). The spikes need to be left in peace down in the substrate.

When I began doing planted tanks there was much debate about water table v.s. substrate ferts. At some point I recall reading a Tom Barr post on his site about the odea that one should be using both types of ferts in most tanks. As Byron pointed out plants take up nuitrients both via leaves and roots and that different nutrients may be taken up by each route.

One last comment re fetilizing. For over 20 years I have used only one brand of ferts and trace elements- Tropica. While I gave ip my CO2 added tank many years ago. I still keep 8 planted tanks. In all but one of them I use Flurish Excel (for CO2) once a week after water changes. I do not overdose it and I do not consider it an algacide. I undestand what the ingredient is and why some folks will not use it. However, after 20+ years of doing so I have never seen a detrimental effect on anything. But I do not hold it against those who whose not to ever put it into their tanks. Each of us must reach our own decision on this.
 
I have found reducing bubbles and supplemental agitation increases co2 buildup and the plants do better. By not removing CO2 I don't have to supplement it. Saves on sugar and yeast. I am lightly stocked with relatively easy fish - guppies, a clown pleco, albino bristlenose, relatively low light and the plants are finally doing well in the 55. I did have to use Flourish Excel a couple of times to get the cyanobacteria out that the LED's blessed me with.
 

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