Be sure the replacement water is the same temperature as your aquarium water.
Fish tank out of water.
The water that is removed with the debris using the gravel vacuum is replaced with dechlorinated water which performs a water change in your aquarium.
If you do not know the history of the tank and what the water conditions really are in this tank this can pose a risk of disease or chemical toxicity to your fish.
However it can cause problems if there s too much evaporation too quickly.
Tank water evaporation is a normal part of the cycle in a fish tank.
Too many fish in your fish tank may also cause a rise in harmful ammonia and nitrites.
Water from another aquarium.
0 0 ppm mg l ammonia nh3 is toxic to fish.
You should unplug your aquarium heater during water changes to prevent it from being exposed to air as the water.
More fish mean more waste and more food for the microbes causing the cloudy water.
This can sometimes be helpful when setting up a new tank but it has many drawbacks.
To understand the problem think of your tank as a little ecosystem something like a tiny lake.
Aside from behavior clashes and stress for the fish themselves the tank conditions in an overstocked tank can often deteriorate to a toxic environment which can result in cloudy tank water.
Look for the warning signs of nitrite poisoning in your fish tank such as poor appetite inactivity fish hanging out by the water filter outflow and brown colored gills.
It is excreted through the gill membranes of fish introducing nitrogen into the aquarium.
These are toxic to fish.
Immediate water changes and adding 1 3 teaspoons of sea salt to the aquarium water will help reduce the effects of nitrite toxicity.
Don t put too many fish in your fish tank.
Any time tap water is added to the aquarium a water conditioner must be used to remove any chlorine chloramine that is present.
As the water evaporates the amount of water for your fish decreases which can make the water quality also decrease as more fish waste gets added to less water.
Experts do recommend the use of special solutions and water conditioners to make the tap water for your fish perfectly safe.
Add activated carbon media to the filter whether loose or carbon pads.
This provides added peace of mind as it ensures that all chemicals that could be harmful to your fish are properly removed before they are.