You forgot to put in the water dechlorinator but it after will fish be okay?

It is important to use a water dechlorinator when setting up a fish tank, as chlorine can be harmful to fish. Chlorine is a disinfectant that is commonly used in municipal water supplies, and it can kill fish by damaging their gills and other tissues.

If you accidentally forget to add a water dechlorinator, you should take immediate action to remove the chlorine from the water. This can be done by using a commercial dechlorinator, or by boiling the water and then letting it cool. Once the chlorine has been removed, you can safely add your fish to the tank.

If you are unable to remove the chlorine from the water, you should monitor your fish closely for signs of stress or illness. If you notice any problems, you should remove the fish from the tank and take them to a pet store or veterinarian for treatment.

Here are some tips for ensuring that you do not forget to add a water dechlorinator:

* Make a checklist of the steps involved in setting up a fish tank, and include adding a water dechlorinator.

* Read the instructions on the water dechlorinator carefully before using it.

* Add the water dechlorinator to the water before adding any fish.

* If you are unsure whether or not the water dechlorinator has been added, test the water for chlorine.