Advice needed

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a 40liter tank is a 10 gallon I think but I am from Europe so also use litres, this is a very good size for a betta fish (well done). I would recommend adding a beneficial bacteria starter solution (they can be bought at most fish stores or online) then if you want/ can, live plants can help with a new tank but you need to research plant care is you want to do this. I would also recommend getting an aquarium test kit to know when it is safe for your betta. it can dendend on a lot of factors but the cycle can normally take anywhere from 3- 5 weeks
hope this helps
 
The 40L tank is about 10 US gallons which is good for a betta. Personally I would not have a betta in anything less for size. These fish need water as close to 80 degrees/ 27 Celsius as possible, the reason for the heater. Betta's don't like strong currents, but still need filtration. Some bettas are also very aggressive and may not fit in well with other fish, especially other fish with long colorful fins like some guppies have. So it is best in a 40L tank to only have a few snails for eating left over food or algae with your betta.

The nitrogen cycle is a natural process in nature that we fish keepers have to emulate in our aquariums. Fish waste, poop uneaten food, etc all will will produce ammonia in decay. Ammonia is very deadly to fish by burning their gills by which fish breath, so nature provides away to get rid of the ammonia by a certain type of bacteria. The ammonia bacteria produces nitrite which again is also deadly to fish in any quantity, because nitrite binds with the fish's blood cells prohibiting it from absorbing oxygen. So nature provides a second bacteria that converts nitrite to nitrate. Nitrate is less harmful to fish of all the gases, and fish can tolerate it up to a certain amount, so around 10ppm or a bit higher even up to 20ppm. The only way to remove nitrate is by water changes which we do every week. We call these two types of bacteria, beneficial bacteria or BB for short.

Very little of the BB lives in the water column so added water from a previously cycled aquarium does not help much. The large colonies of BB live in the aquariums filter, which should have bio-media. BB also lives in the sponges etc that collect all the debris while in the process of cleaning the aquarium. Unless you are on well water most tap water has chlorine in it which will kill BB, so never clean filter sponges in tap water. Clean sponges ect, in a bucket of aquarium water which is safe for BB.

When you first setup a new aquarium fish can possibly die from what is known as the new tank syndrome. What this means is that the beneficial bacteria have yet to be established in sufficient quantities to take care of the two most dangerous types of gases, ammonia and nitrite. This process of colonizing the BB takes time in a new aquarium sometimes up to a couple of months. But the process is speeded up by two different methods. One by getting bio-media or gravel from an aquarium that has already been well established with beneficial bacteria. Second by purchasing bottles of BB or what is called bio-balls which is balls that contain BB. Even then it still takes awhile for the BB to colonize in sufficient amount to take care of the load in waste and uneaten fish food as it decays producing ammonia.

But with on betta in a 40L tank you are in luck, because these fish by themselves do not produce much of a load on that size of a tank. But you do need to get some type of reliable water testing kit to test the water for ammonia, nitrite, nitrate, an ph. You can also get test kits for kh and gh which is another subject.
 
The 40L tank is about 10 US gallons which is good for a betta. Personally I would not have a betta in anything less for size. These fish need water as close to 80 degrees/ 27 Celsius as possible, the reason for the heater. Betta's don't like strong currents, but still need filtration. Some bettas are also very aggressive and may not fit in well with other fish, especially other fish with long colorful fins like some guppies have. So it is best in a 40L tank to only have a few snails for eating left over food or algae with your betta.

The nitrogen cycle is a natural process in nature that we fish keepers have to emulate in our aquariums. Fish waste, poop uneaten food, etc all will will produce ammonia in decay. Ammonia is very deadly to fish by burning their gills by which fish breath, so nature provides away to get rid of the ammonia by a certain type of bacteria. The ammonia bacteria produces nitrite which again is also deadly to fish in any quantity, because nitrite binds with the fish's blood cells prohibiting it from absorbing oxygen. So nature provides a second bacteria that converts nitrite to nitrate. Nitrate is less harmful to fish of all the gases, and fish can tolerate it up to a certain amount, so around 10ppm or a bit higher even up to 20ppm. The only way to remove nitrate is by water changes which we do every week. We call these two types of bacteria, beneficial bacteria or BB for short.

Very little of the BB lives in the water column so added water from a previously cycled aquarium does not help much. The large colonies of BB live in the aquariums filter, which should have bio-media. BB also lives in the sponges etc that collect all the debris while in the process of cleaning the aquarium. Unless you are on well water most tap water has chlorine in it which will kill BB, so never clean filter sponges in tap water. Clean sponges ect, in a bucket of aquarium water which is safe for BB.

When you first setup a new aquarium fish can possibly die from what is known as the new tank syndrome. What this means is that the beneficial bacteria have yet to be established in sufficient quantities to take care of the two most dangerous types of gases, ammonia and nitrite. This process of colonizing the BB takes time in a new aquarium sometimes up to a couple of months. But the process is speeded up by two different methods. One by getting bio-media or gravel from an aquarium that has already been well established with beneficial bacteria. Second by purchasing bottles of BB or what is called bio-balls which is balls that contain BB. Even then it still takes awhile for the BB to colonize in sufficient amount to take care of the load in waste and uneaten fish food as it decays producing ammonia.

But with on betta in a 40L tank you are in luck, because these fish by themselves do not produce much of a load on that size of a tank. But you do need to get some type of reliable water testing kit to test the water for ammonia, nitrite, nitrate, an ph. You can also get test kits for kh and gh which is another subject.
Wow, im learning so much more but in depth, its great. Thank you so much honestly
 

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