Pourquoi l’eau des discus est elle si importante?
As many aquatic species, the water is the living environment of fishes. Like our air it contains oxygen, CO2, nitrogen and many other elements that influence their health.
Water This famous element source of life 'bathes' our fish and these are intimately linked to it.
You should also know that water is a very good solvent ; This means, it has good abilities to dissolve many substances.
These include for example the gas (oxygen, CO2 etc.) mineral salts (Calcium, magnesium, sodium…) or even metals (lead, copper…)
And this will complicate the subject because, These elements present in the water of the discus can play an important role in their physiology and even interact with each other.
Les discus sont originaires d’Amérique du sud…
Wild discus originating from the rio Xingú in the Amazon
The waters which saw rise to these fishes in the wild are sweet (they contain little of minerals), and acid (pH less than 7), Heiko Bleher in his book the Bleher's discus vol. 1» measure e.g. North Victoria do Xingu in 2002 a pH of 6,5 , an conductivity of 21 micro-Siemens and a temperature 28.5 ° C.
The discus therefore adapted over its evolution to live in this type of environment.
Reading this, many of you froncerons eyebrows in this scratching head... 'my '. discus do not live in such water parameters ! And they are living very well !"
I totally agree with you, but I think that certain facts are interesting to hear. While years of breeding and selections you made our current pigeon blood and other more tolerant in red turquoise water quality, It nevertheless remains that this fish Party keeps its natural requirements.
Furthermore, need to highlight the fact that human breed the discus recently (before the second world war) and that the real explosion of varieties we know not to start in the 1980s...
It is clear that each fish species has its requirements and own ranges of tolerances. The tolerance range of discus example is smaller than a neon innesi.
The first parameters to know: hardness KH and GH
For the maintenance of domestic discus, a KH between 2 and 4 German degrees is suitable with a GH between 4 and 7 degrees. Naturally, with such hardnesses, the pH the Aquarium should be neutral to acid (7 and less than 7).
With regards to this nitrogen substances , the discus ponctually tolerates some variations, but to not it bother I recommend to not go above 25 mg/L of nitrates.
For the’ammonia and nitrites, the zero values are imperative ; their presence being toxic to fish.
The discus will be sensitive to the presence of pollutants in the water such as heavy metals, chloramines and other. I have no precise data on this subject but it is important to neutralize these elements before any water change with tap water ; and this thanks to a contionneur water.
I don't count the number of users’tap water not conditioned with whom I could discuss which were one day facing problems of floods as a result of mortality water changes…
With regard to the rate of water changes, It is advisable to perform approximately 30% minimum volume of the aquarium once per week. (We are not talking only of maintenance of discus 'Community' sandboxed and not farmed.) This frequency varies of course according of each case: reproduction, growing, population of the aquarium etc.
(See also: Rearing and reproduction of the discus on video)
Discus and CO2: Attention danger
As noted you in the article on the maintenance of the discus, I urge you to check your diffusion of CO2 if you want to use for your plants.
A pH electronic meter properly calibrated (!) or permanent controller such as those proposed by the company Dennerle are essential to avoid poisoning.
The diffusion of CO2 is too often used to lower the pH of l’water of the discus. You should remember that CO2 is beneficial to plants but that the discus appreciate that very little…
From 20 mg/L I noticed that some discus could be strongly unwell.
A few interesting to address special cases…
The discus like other fish can adapt to other parameters than those listed above.
Thus one may encounter some cases or conditions of maintenance and management of the water quality defy the needs known from this fish.
Nevertheless, well, we must be careful to consider these special cases and the procedures to be followed. Because this is often isolated cases that are explained very well.
Here are a few examples that I was able to meet and they will certainly not be the last I will meet !
Attention to nitrate tolerance…
The content in Nitrate growing rapidly
When there is a lot of discus in l’aquarium…
Some discussophiles have a somewhat risky maintenance: Non-regular rate of water change , water quality not adequate in relation to the needs of the discus etc. They are often surprised to see their new acquisition do not adapt to their aquarium and die.
They do not understand that a discus purchased recently could die while the others present in the aquarium for many months appear to be in good health.
After having rejected tracks related to the problems of transport and acclimatization, I simply invite them to test the water from their trays... They will often find some explanations!
It's often due to lack of knowledge, by habit or negligence that the simple test of water is not done. Or the water parameters a aquarium are not frozen ; more or less, they can change quickly over time.
Take the case of nitrates ; they accumulate over time in l’aquarium. To avoid high values, It is necessary to ensure the water changes regular and fairly consistent. If these water changes are not correctly carried out, the value nitrates of the aquarium tends to increase slowly, but surely over the months .
The fishes present in l’aquarium fit as this change occurs gradually.
I have already observed discus with bright behavior with appetites of ogres in a tank with more than 100 mg/L of nitrates. However, such a situation cannot last and it is absolutely recommended to Acclimate a new discus in this type of water even if those already present are doing well !
Because with stress of transport , acclimation, competition to fit into a new group of discus; add with environmental stress. It then minimizes the chances of adaptation !
Of course, many others parameters evolve and may cause problems to accommodate the new fish. I voluntarily took the example of nitrates Since it is for me the most explicit.
Accident after a change with the tap water
Some have the chance to inhabit a region or water from the tap has ideal characteristics for the maintenance of discus (Lucky guys !!!)
Can this mean that the discus keeps easily in water come directly out of tap ?
My answer is simply "no"., because water quality flowing to the tap is different from one region to another, from one city to another, a neighbourhood to another or even a block of houses to another !
Today, There are few place where the water network is ideal for the discus ; but there are and the key is to test This water and above all do not forget to prepare. Thence to assert that the discus live in tap water, you can do a big mistake…
Personally I prefer to read or hear '' my '' discus live in 'My' tap water. You will tell me this can be a detail, but it is important when this kind of information arrives at the ears of the new enthusiasts.
Take the example of 3 discus breeders:
The first breed discus in a medium hard water (harder than water usually used for maintenance of discus), the second in a water very sweet (Much more sweet as the waters frequently used for the maintenance of the discus), the third as it raises its fishes in water from a water softener home.
These three breeders raise the same species of fish : the discus ; yet a few points the différencieront…
* The discus the first breeders will be relatively undemanding in relation to the hardness of the water (GH/KH) tolerant without the highest average value problem. You will find him a good amount of so-called "old" varieties (the first selected by man)
* The second breeders aura of fishes that will require better monitoring at the level of the water hardness, and to bring closer a maintenance more classic. Some varieties that he will be very recent and still more demanding.
* As for the third breeders, These fish will almost be a curiosity and can be read in all the textbooks that water of domestic softeners is "unsuitable" for aquarium use. This breeders raises a single variety and its fishes will fit in quite environment.
German discus Stendker are deemed to accept rather high hardness
This focuses on two specific cases :
The first is related to the strain. The’breeders offers to its stem a certain type of environment it is important to know. Some discus bred for many generations in the characteristics of water somewhat special will develop a tolerance range different from that proposed in this article or the literature.
There is a strong chance that the first results d’tank raised ones the first and the third breeder have been very good ; but the work of selection, These strains have now developed features to adapt to their environment.
Yet we cannot advise all discus enthusiasts to move their fish to l’hard water or exit straight with a softener.
Inquire about the quality of water than l’breeders or the store uses is essential before buying.
The second interesting to note case is related to the variety. Indeed varieties say "older" such cobalts, pigeon blood, turquoises are generally more tolerant of water quality. The most recent varieties (or from crossing with wild forms) remaining generally higher.
Recent varieties generally require greater attention.
IMPORTANT: la qualité de l’environnement de l’animal…
As you seen, the water is an essential element that influences the life and health of fishes.
Ensure a good environment to your discus (ensure a good water quality) will be the best of the prevention against disease ; environmental stress is often the first stress to which the discus must face. In a healthy environment, the body of discus is capable of fighting alone against many pathogenic agents (of diseases).
In addition, as we have seen, don't pull too hasty conclusions about a maintenanceSpecial s that you may encounter. Be regular in your maintenance in order to propose to your discus an water quality stable in line with their needs. Move away from water needs of the discus, This is the risk of exposure to a problem "x" or "y"..
So, you have just finished reading the 1st chapter ! Find the next article on the water parameters and their meanings. Pending, If you want, You can at any time post your comments or questions in the topic "comment" at the bottom page.
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