It depends on the fish tank. They range from less than 2 gallons to over 300 gallons.
The unit typically used to measure the amount of water in a fish tank is liters (L) or gallons (gal).
You would use a measuring cup or a graduated cylinder to measure the amount of water in a fish tank. Alternatively, you can also calculate the volume of water by measuring the length, width, and height of the tank and using a formula for volume.
Your fish tank may look foggy due to a buildup of bacteria, algae, or debris in the water. To clear it up, you can try cleaning the tank, changing the water, reducing the amount of food you give your fish, and adding a water clarifier or filter to improve water quality.
The water in your fish tank is turning green because of an overgrowth of algae. Algae thrive in environments with excess nutrients and sunlight, leading to the green coloration of the water. To address this issue, you can reduce the amount of light your tank receives, perform regular water changes, and avoid overfeeding your fish.
More information is needed to give you a educated guess as to what caused your fish to die after only 24 hours. You need to test your water for the following, ammonia, nitrates, nitrites, PH, alkalinity, and chlorine. Is this a new or established tank? If new, did you condition the water with a dechlorinator? What was your water temperature? How did you acclimate your purchased fish to your tank water? Here is the best way to acclimate new fish to your tank, I've used this method for over 25 years and NEVER lost a new fish within the first few months of purchase. Get a good clean container at least twice the size of the amount of water in your bag with fish. Make sure there is no soap or other types of residue in this container, carefully empty the bag of water and fish into this container. For the next hour, every ten minutes, slowly add a small amount of water from your tank to this container. After the hour is up you should have at least twice the amount of water in this container and you can safely net the fish out and place them in your tank. Throw the water in this container away, you don't know what you might introduce into your tank with this water, bad enough the fish will have whatever's in the water on their bodies.
Salt Water Fish
The green and cloudy water in your fish tank is likely caused by an overgrowth of algae. Algae thrive in environments with excess nutrients and sunlight, leading to the water turning green and cloudy. To address this issue, you can try reducing the amount of light the tank receives, performing regular water changes, and ensuring proper filtration and maintenance of the tank.
The green color in your fish tank after a water change is likely due to an overgrowth of algae. Algae thrive in water with excess nutrients and sunlight, which can occur when the water is changed too infrequently or when the tank is exposed to too much light. To address this issue, you can try reducing the amount of light the tank receives, cleaning the tank more regularly, and possibly adding algae-eating fish or plants to help control the algae growth.
Zebra Danios can handle a small amount of salt in their water but it is not a smart thing to have in your fresh water tank. The reason for this is, salt can be used as a medication for some fish ailments. If there is salt already in the water, in order to dose the fish you will have to put in a measured/correct amount of salt thereby overdosing the tank and maybe killing the fish.
i found that hose water does not kill your freshwater fish as long as you prepare it first. first get a bucket and fill with the needed amount of tap water. then ad conditioner to the water to remove the chlorine and ammonia. i suggest that you have a spair tank heater if your tanks are regulated and heat the bucket water to the right temp before adding it to the tank as its a bit of a rude shock to fish if you just add cold water to a tank where the temp. is warmer. its better the water be warmer than the tank water than cooler. its like you being thrown under a cold shower. when the water is right temp. add to the tank. If you put the amount of water that you need to add to your tank and let it sit in a cooking pot or other clean container for 24 hours and the chlorine in it will evaporate. I learned this trick from a professional fish breeder.
Assuming the dirty fish tank has had fish and water in it, without doing various specialised water tests it is impossible to tell what is in it.
It might be unsafe to drink because fish food, fish scales, fish waste, and many different kinds of bacteria are in fish tank water.