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Saltwater and Reef Tank Cycling

Saltwater and Reef Tank Cycling

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Tips on cycling your fishtank.
Before you add live fish to your tank you will need to cycle it for a period of time to create a good environment for your fish life. Begin by turning on all the equipment and let it run constantly for a few days. If mixing the sea salt in the freshwater tank, follow the procedure on the package for mixing but make sure that the filter is turned on while mixing. When completed, fill the filter with the saltwater. Turn on the rest of the equipment and run the tank constantly for a few days.

Cycling with Live Rock

Cycling with live rock allows the dying animals and plants contained on the rock to die off and the resulting products from the decay of the tissue to be further processed into relatively harmless compounds. During this cycling period the ammonia level rapidly climbs as bacteria process the dead organisms. This high level of ammonia, which is toxic to fish and plant life, can have a synergistic effect and cause more organisms to die. This in turn produces more ammonia. The populations of bacteria involved in converting ammonia to nitrite quickly build up to sufficient numbers and process the waste generated while the ammonia levels go down to undetectable levels.

You can buy live rock cycled, partially cycled or almost straight from the reef. If the live rock is going to be used in an existing reef aquarium, then cycled live rock should be used. This will minimize the peak in ammonia and nitrite caused by the addition of the rock to the tank.

How Do You Cycle Live Rock?

Start by putting the live rock into the tank or have another tank specifically for cycling purposes. Make sure that you have a skimmer in the system as well. The use of the skimmer and activated carbon removes compounds before they can break down from the bacteria. Add circulation to the water to allow good nutrient and waste exchange, but no lighting at this point. Leave this setup in place for about 2-4 weeks while monitoring the ammonia and nitrite levels. The length of the cycle takes around 2-4 weeks, from the time the rock is placed in the vessel to when the nitrite levels drop to undetectable levels.

It is also important to operate the lights during the cycling period. Operate them by increasing the length of time used during the cycling period. Start at around 6 hours per day, then increase by an hour every couple of days until a full days length is reached. In addition to the lighting used, activated carbon should be used, and regular water changes should be implemented.

Here is a simple process to follow for cycling with live rock.

  • Remove any white, slimy areas and anything else that is decaying on the rock. Removal will help to minimize the stress on the tank
  • Inspect each rock for the presence of bristle worms and remove any if found
  • It is a good idea to remove any plant growth such as algae
  • Arrange the live rock in the aquarium. Ensure that only small areas are in contact with the bottom of the aquarium and between rocks. This will ensure good water circulation
  • Position return and circulation pumps so that there is good water movement throughout the entire tank
  • A mechanical filter can be used to help remove suspended solids from the system, but make sure that it is cleaned regularly, every day is preferred
  • Operate the skimmer continuously
  • Keep activated carbon in a high flow area so that the water passes through it. Once the cycle is over, you can use activated carbon intermittently or continuously if you want to
  • Operate the lighting starting with a 6-hour period. Gradually increase this by an hour every couple of days until about 12-14 hours is reached
  • If white spots appear on the rock or something appears to be dying then siphon or remove it from the rock
  • Change the water regularly and siphon out any debris that has settled
  • Start a regular maintenance program at the length and volume for a normal operating system. This varies, but around 5-10% of the system volume per month is currently recommended

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