The reason being because of the fact that the aquarium has not begun to 'cycle' yet. Aquarium cycling has several other names it's also called 'start-up cycle', 'new tank syndrome', 'nitrification cycle', 'nitrogen cycle' or 'biological cycle'.
In a new tank ammonia, produced from fish waste and excess food, builds up to your high concentration in the tank water. This is often poisonous to the fish if finally it was free to continue it'd kill all of them. Happily the presence of this very ammonia prompts the growth of causing particular kind of bacteria (Nitrosonomos) which converts the toxic ammonia into nitrites. That's not the tip of a given story because nitrites are equally toxic to all of your fish. So it's actually good job that the nitrite causes other bacteria to grow (Nitrospira and Nitrobacter) which convert the nitrite into considerably less toxic nitrate. We eliminate the nitrate by changing some of the aquarium water every a handful of weeks.
Aquarium Laut Jakarta cycling happens to be the name given to all the above process where ammonia is become nitrite and nitrite will become nitrate. The problem is, it brings time this cycle to become founded in a whole new aquarium. The ammonia has to build up to a certain level in order for the good bacteria to rise that convert ammonia to nitrites. Similarly the nitrites ought to be comprised in order when it comes to the bacteria to produce which convert the nitrites into nitrates.
The fact is, the process might take anywhere between 7 days to 2 months to initiate. During that time toxic ammonia and nitrites are building up in the tank. So this is a problem that has got to happen quickly and preferably with minimum impact on your fish.
The old method of dealing with this happened to store a number of hardy fish straight into the new tank and make them might go to the cycling process. This really is not now considered the popular method because it is basically cruel to the fish. The fish are sometimes known as suicide, starter or disposable fish. Zebra dannios were often used because they're very hardy fish. (Source)
The trendy way is to carry out 'fishless cycling'. To develop the ammonia, fish food might be put into the tank usually every 12 hours or raw fish or shrimp can possibly be added or possibly pure ammonia might be dropped into the tank. Any one these methods will produce the ammonia which can start the cycling. The actual procedure might be monitored with standard test strips obtainable from most aquarium shops.
First off the ammonia levels will go up. Then they grow to fall just like the nitrite levels rise. Finally the nitrite levels fall as the nitrate levels rise. Right now it's important to start changing the fluid (about ¼ to 1/3 every couple of weeks) and also it is the time you can add your fish towards the tank.
Products are available that could speed up entire process by introducing the beneficial bacteria.
As a result there you really are. Avoid the biggest beginners' mistake. Make sure the new tank is cycling before you think of adding any fish.