Community fish used to cycle saltwater tanks:

There are a few things that may help speed up the cycling of a fish tank.
Photo provided by Flickr
Cycling your fish tank is not difficult, but it does take some time – there are also several different methods you can use. In this section, you will learn what cycling is, how you do it, how long it will take, the number of fish needed, and much more!
of How to Cycle a Fish Tank was reviewed by Sarah Johnson on February 25, 2016.
Photo provided by Flickr
The cycling process usually takes between 6 and 8 weeks. At the end of it you should detect no ammonia or nitrite but raising nitrate levels. At this time you can start adding more fish to the tank, however, only a few at a time, to allow the biological filter to adjust to the increased load. Again monitor the levels of ammonia and nitrite carefully as you add new fish. Aggressive fish used to cycle a saltwater tank:
Photo provided by FlickrCongratulations on successfully completing the fishless tank cycling process.
Photo provided by Flickr2) Not Cycling New Tanks Before Adding Fish
Photo provided by Flickr
Your tank is fully cycled once nitrates are being produced (andammonia and nitrite levels are zero). To determine when the cycle hascompleted, buy appropriate test kits (see the section)and measure the levelsyourself, or bring water samples to your fish store and let themperform the test for you (perhaps for a small fee). The cycling processnormally takes anywhere from 2-6 weeks. At temperatures below 70F, ittakes even longer to cycle a tank. In comparison to other types ofbacteria, nitrifying bacteria grow slowly. Under optimal conditions,it takes fully 15 hours for a colony to double in size!Your tank is fully cycled once nitrates are being produced (andammonia and nitrite levels are zero). To determine when the cycle hascompleted, buy appropriate test kits (see ) and measure the levelsyourself, or bring water samples to your fish store and let themperform the test for you (perhaps for a small fee). This processnormally takes anywhere from 2-6 weeks. At temperatures below 70F, ittakes even longer to cycle a tank. In comparison to other types ofbacteria, Nitrifying bacteria grow slowly. Under optimal conditions,it takes fully 15 hours for a colony to double in size!Standard test kits measure total ammonia (ammonia plus ammonium)without distinguishing between the two forms. The following chartgives the maximum long-term level of ammonia-N in mg/L (ppm) that can beconsidered safe at a given temperature and pH. Again, note that a tankwith an established biological filter will have no detectable ammonia;this chart is provided only for emergency purposes. If your levelsapproach or exceed the levels shown, take emergency action IMMEDIATELY.Should ammonia levels become high during the cycling process,corrective measures will need to be taken to prevent fish deaths. Most likely, you will simplyperform a sequence of partial water changes, thereby diluting ammoniato safer concentrations.Standard test kits measure total ammonia (ammonia plus ammonium)without distinguishing between the two forms. The following chartgives the maximum long-term level of nitrate-N in mg/L that can beconsidered safe at a given temperature and pH. Again, note that a tankwith an established biological filter will have no detectable ammonia;this chart is provided only for emergency purposes. If your levelsapproach or exceed the levels shown, take emergency action IMMEDIATELY.Should ammonia levels become high during the cycling process,corrective measures will need to be taken to prevent fish deaths. XXXdescribes such procedures in detail. Most likely, you will simplyperform a sequence of partial water changes, thereby diluting ammoniato safer concentrations.In an established tank, ammonia should be undetectable usingstandard test kits available at stores. The presence of detectablelevels indicates that your bio filter is not working adequately,either because your tank has not yet cycled, or the filter isnot functioning adequately (e.g., too small for fish load, clogged,etc.) It is imperative that you address the problem (filter) inaddition to the symptoms (high ammonia levels).It is also possible to cycle a tank without ever adding fish. Therole fish provide in the cycling process is simply their steadyproduction of ammonia; the same effect can be achieved by addingchemical forms of ammonia manually (e.g., ammonium chloride). However,it is a bit more complicated than using fish because the waterchemistry needs to be monitored more closely in order to add theproper amount of ammonia on a day-to-day basis.