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NITROGEN CYCLE
The nitrogen cycle is the natural process that occurs in your tank to transform the harmful chemicals produced by the fish via excrement etc. into less harmful chemicals. Out of all the cycles in your tank it is one of the most important to understand and any serious fish keeper should realise the impact it has on your aquarium. This cycle is also responsible for New Tank Syndrome and is very important in tank cycling, which is covered in another sheet.
The Nitrogen Cycle involves three main chemicals; ammonia, nitrite and nitrate. During the cycle, these chemicals are transformed into less harmful chemicals by bacteria and plants. Due to the difficulty of detecting ammonia in the past and how little was known of its affect on the cycle this process was known as the Nitrite Cycle at one point.
The nitrogen cycle runs as follows (whilst reading through these instructions it may be helpful to refer to the diagram opposite):
Ammonia [NH3] enters the water through fish respiration and excretion, as well as decaying matter in the tank.
Ammonia is toxic to fish and normal symptoms for ammonia poisoning are ragged fins and inflamed/red gills. Even low amounts can cause illness so always ensure than your ammonia readings for your water are zero.
Plants use ammonia as a food source, although they use very little.
Ammonia is converted into nitrite [NO2] by nitrosomonas bacteria (as well as others).
Nitrite is less toxic to fish than ammonia, but is still harmful. Low levels can be tolerated by fish, but always ensure than any readings you take are zero. If you have a constant nitrite reading then there is a problem in your system.
Nitrosomonas and nitrobacter - see next step - bacteria are known as litho-tropic bacteria. This means that they require oxygen to survive.
Nitrite is converted into nitrate [NO3] by nitrobacter bacteria (as well as others).
Although not nearly as toxic as ammonia and nitrite, high nitrate levels can lead to outbreaks of disease such as white spot and fungus due to the nitrates reducing the fish's resistance to disease.
High nitrate levels may also lead to algal bursts as the extra nutrients provided by the nitrates promote their growth.
Nitrates are converted into harmless chemicals by plants and algae
Although used by plants and algae as a food source, under normal conditions - unless an aquarium is well stocked with healthy plants - nitrates will build up over time.
Regular water changes will help to reduce the amount of nitrate, although some local water supplies may already have high levels of nitrate prior to making a water change.
Adding extra plants to an aquarium will help to reduce nitrate as well as keeping algae growth down. This is due to the plants out-competing the algae for nutrients.
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Test Kits
We will test your water for a small charge and thoroughly explain each result so that if there is a problem, you understand why it is there and how to rectify it.
The first rule to fishkeeping, is to first become a water keeper.
The second rule is if you look after their water the fish will look after themselves.
NITROGEN CYCLE
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Fish and decaying matter produce ammonia [NH3].
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Plants and algae use nitrate as food turning it into harmless chemicals.
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Ammonia is converted into nitrite [NO2] by nitrosomonas bacteria.
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Nitrite is converted into nitrate [NO3] by nitrobacter bacteria.
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Water quality in your aquarium changes very quickly, your tank water should be tested every week.
Never assume because your fish look healthy and your water is clear that one or more problems are not occuring.
Fish can acclimatize themselves for a short time to many changes in their water quality, for example P.H drops very quickly, we generally recommend a neutral P.H of 7.0 for most tropical community fish, this however can only be achieved by regular testing and buffering with one of the many products available.
Another common change in any aquarium is a build up of nitrite (in simple terms a toxin given off fish waste & decaying matters) see nitrogen cycle.
High levels of nitrite can be caused by many factors including overfeeding, changing too much water, filters not being cleaned often enough or vital bacteria being lost by washing filters in tap water instead of old tank water.
You normally only become aware of a problem when you purchase new fish which in turn die, many test kits are available which allow you to monitor your water quality very easily and will prevent you from needlessly losing fish,
allowing you to get the most from your hobby.
TETRA KITS INCLUDE
p.h freshwater
p.h marine
nitrite (no2)
nitrate (no3)
ammonia
laborett multi kit
refils available for:
p.h fresh
nitrite(no2)
A.P.I Freshwater/Saltwater Ammonia Test Kit, 130 tests
For Fresh & Salt Water Aquariums
Tests ammonia levels from 0 to 8 ppm.
Helps indicate efficiency of the biological filter.
Has a development time of only five minutes.
Ammonia, the number one killer of tropical fish, is continually produced in the aquarium from fish waste, decomposing plants, and uneaten fish food.
A.P.I Deluxe P.H kit for freshwater
Enables user to adjust pH levels as required and includes 1.25 oz bottles of pH Up, pH Down, and pH Indicator Solution.
Tests the pH of water within a 6.0 to 7.6 range. 250 tests per kit.
A.P.I Nitrite kit
Tests for nitrite in freshwater & saltwater aquariums.
Reads 0-5 ppm, performs 180 tests.
A.P.I Nitrate kit
Effective for both fresh and saltwater aquariums.
High levels of nitrate are a food source for unwanted algae and indicate poor water quality and health problems for fish.
Tests nitrate levels from 0 to 160 ppm. 110 tests
A.P.I freshwater master kit
Tests water 6 different ways to protect tropical fish from dangerous water conditions.
Tests include: freshwater pH, ammonia, nitrite, high range pH, GH & KH, 4 test tubes, tray, instructions.
A.P.I saltwater master kit
A complete kit for testing saltwater aquariums.
Test kit includes:high range pH, ammonia,nitrite,nitrate,4 test tubes, tray & rack. Tests water 4 ways to protect marine fish from dangerous water conditions.
Salifert Profi Test Kits 
Recommended Trace Element Levels in Marine Aquariums
Boron 4.4-4.8 mg/litre
Iodine 0.06 mg/litre
Magnesium 1350-1500 mg/litre
Calcium 420-450 mg/litre
Alkalinity 2.8 meq/litre or 8dkH
Phosphate 0.04 mg/litre
Strontium 5-20 mg/litre
NITRITE
NITRATE
PHOSPHATE
CALCIUM
COPPER
OXYGEN
ORGANICS
MAGNESIUM
BORON
STRONTIUM
AMMONIA
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