yeah fresh and salt need to be cylced. here's my explanation of the cycling process:
- fish take dookies in the water
- dookies and uneaten food produces ammonia (harmful to fish)
- bacteria in filters consume ammonia, and produce nitrite as a byproduct
- another type of bacteria consume the nitrite, and produces nitrate as a byproduct
- nitrates are reduced by doing regular water changes
This is what happens in a cycled tank. in a new tank, there is no bacteria to consume ammonia and nitrites, these are harmful to fish. when cycling a tank, your introducing ammonia to set up the colonies of bacteria to consume ammonia/nitrite. princess used raw shrimp for her ammonia source. by decayin in the water, it produced ammonia to start feeding the bacteria.
some people use shrimp, others add pure ammonia, and other use cheap/hardy fish (see my sig) to produce the ammonia. did that make any sense?