This is something more people need to understand and do with there tanks now a days and most I think have no idea how to properly do this.
Foreword:
What you need:
Optional:
Preparation:
- First, let me state that this will not be a scholarly article about Nitrobacter, Nitrosomas or the hows and whys of the nitrogen cycle. Many more learned men and women than I have already covered that ground, and done it much better than I ever could. I have included some links at the bottom of this article. PLEASE read them for more in depth information.
- Second, this is an article intended for FRESHWATER TANKS ONLY!!! If you are beginning a marine tank, please refer to other sources.
- Third, relax!! This sounds complicated but it isn't. Think of it as a chemistry experiment. You have no fish in there, so the only thing you can kill if you make a mistake is some bacteria. Don't get hung up on exact readings on your test kit - the only the reading must be exact is when you reach zero.
- Aquarium.
- Substrate (usually medium to small gravel, but can be of your choice).
- Filter and filter medium.
- Heater.
- Thermometer.
- Dechlorinator/Dechloriminator (be sure it's not something that "neutralizes ammonia" or you'll get false readings on your ammonia tests).
- Tests for ammonia and nitrite (nitrate is handy, too, but not necessary).
- Pure ammonia (also called clear ammonia). Check the ingredients - if it has anything other than water and ammonia (fragrance, surfactants, etc.) it's not the right kind.
- Rocks, wood or other decorations such as sunken ships, bubbling treasure chests, etc.
- Plants - real, plastic or silk.
- Lighting (not optional if you have plants).
Set up the aquarium, including substrate, filter, and heater, and fill with water. Be sure to dechlorinate the water. Turn everything on. Add your plants and decorations.
Set the heater to keep the temperature of the water up in the mid to high 80's.
Provide extra aeration if possible. Aeration in a body of water only happens at the surface. To increase aeration, keep the water surface moving. With an outside hang on-the-back power filter, you can lower the water level a couple of inches so that water falling from the filter outflow makes a bigger splash. If the sound of the splashing makes you nuts, don't do it. An airstone and small pump works, too.
If you have access to materials from a SAFE source (not your fish store), see if you can get a cup of gravel, a used filter sponge, a decoration - anything that has been in an established aquarium a while - and put it in your tank just before you start. This will speed up the process, but is not necessary.
Now You're Ready:Set the heater to keep the temperature of the water up in the mid to high 80's.
Provide extra aeration if possible. Aeration in a body of water only happens at the surface. To increase aeration, keep the water surface moving. With an outside hang on-the-back power filter, you can lower the water level a couple of inches so that water falling from the filter outflow makes a bigger splash. If the sound of the splashing makes you nuts, don't do it. An airstone and small pump works, too.
If you have access to materials from a SAFE source (not your fish store), see if you can get a cup of gravel, a used filter sponge, a decoration - anything that has been in an established aquarium a while - and put it in your tank just before you start. This will speed up the process, but is not necessary.
Keep the filter running at maximum capacity throughout the cycling process.
Do not change water or clean anything in the tank during the cycle - it's not necessary and you might disrupt things. Besides, once the fish are in there you'll change water often enough. Enjoy your hiatus. If the water level gets too low, you may top off the tank with dechlorinated water.
Put 3-5 drops of pure ammonia per gallon in the tank, or enough ammonia to make your test kit read 4-5. Now fire up your computer and start researching the fish you want to put in there once the cycle is finished - you are done for now.
Test ammonia levels every day. When the ammonia reaches 1, add more ammonia to bring the level back to 4-5. Continue to put ammonia in the tank until the ammonia level goes to zero within 8-12 hours after the ammonia is put in. Once the tank shows the ability to lower the ammonia level in this time interval, a sufficient population of bacteria is resident in your tank and you're halfway there. This part usually takes about two weeks, but can take as long as four weeks.
Now test for nitrites. They should be VERY high. The nitrites will probably exceed the highest limit of your nitrite test. This isn't a problem, if course, because you have no fish to worry about. Continue to add enough ammonia each day to bring the ammonia level to 1 or 2.
The high-nitrite stage seems to last forever. It seems to me that Nitrobacter (the nitrite-consuming bacteria) grow more slowly than Nitrosomas (the ammonia-consuming bacteria).
When the nitrite drops, it will drop rapidly. When the test reads zero for 24 hours or more, your tank is cycled. This is the payoff for all your patience.
Keep adding ammonia until right before you add fish. Then adjust the heater down to a liveable temperature and do a very large water change (at least 90%). (Remember, to add dechlorinator.)
Recommended reading on fishless cycling:Do not change water or clean anything in the tank during the cycle - it's not necessary and you might disrupt things. Besides, once the fish are in there you'll change water often enough. Enjoy your hiatus. If the water level gets too low, you may top off the tank with dechlorinated water.
Put 3-5 drops of pure ammonia per gallon in the tank, or enough ammonia to make your test kit read 4-5. Now fire up your computer and start researching the fish you want to put in there once the cycle is finished - you are done for now.
Test ammonia levels every day. When the ammonia reaches 1, add more ammonia to bring the level back to 4-5. Continue to put ammonia in the tank until the ammonia level goes to zero within 8-12 hours after the ammonia is put in. Once the tank shows the ability to lower the ammonia level in this time interval, a sufficient population of bacteria is resident in your tank and you're halfway there. This part usually takes about two weeks, but can take as long as four weeks.
Now test for nitrites. They should be VERY high. The nitrites will probably exceed the highest limit of your nitrite test. This isn't a problem, if course, because you have no fish to worry about. Continue to add enough ammonia each day to bring the ammonia level to 1 or 2.
The high-nitrite stage seems to last forever. It seems to me that Nitrobacter (the nitrite-consuming bacteria) grow more slowly than Nitrosomas (the ammonia-consuming bacteria).
When the nitrite drops, it will drop rapidly. When the test reads zero for 24 hours or more, your tank is cycled. This is the payoff for all your patience.
Keep adding ammonia until right before you add fish. Then adjust the heater down to a liveable temperature and do a very large water change (at least 90%). (Remember, to add dechlorinator.)
