To all intents and purposes they do the same thing in your tank and that is poison the water and kill the fish. NH3 is ammonia and is the product of fish breathing in Alkaline water. NH4 is ammonium and occurs as a result of fish breathing in Acid water. These naturally occurring products of aquatic life must be removed by some means. The bacteria that form in a biological filter convert both NH3 and NH4 into NO2 (nitrite) which is also poisonous and then convert the NO2 into NO3 (nitrate) which is relatively harmless and can be used up by plants
Moldy cheese or an eyeball
Salt water contain dissolved sodium chloride; chemical and physical properties are different compared with fresh water.
You can raise a sea urchin in a salt-water aquarium. There are no fresh water sea urchins so you would need a salt-water aquarium to properly care for the urchin.
Nothing...they die....
one dirty one isn't
As a decoration, maybe. As a living entity--NOPE.
yes. please provide tips on fresh water aquarium fish too.
The difference is the salt concentration in the water. Fresh water aquariums mimic the environment of lakes, ponds, or rivers. However, salt water aquariums have water that is salty like oceans. Fish are either freshwater or saltwater. Do not put them in the wrong water, or they will die.
Salt water is different because it is heavier than fresh water.
they need dechlorinated fresh water, and dechlorinated salt water made with aquarium salt.
Explain what would happen if a piece of seaweed from the ocean was placed in a fresh water aquarium?
Done frequently, and easily with many species.