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Cayno is caused by excess organics in a system. This can be brought on by excess feeding, overstocking, lack of filtration, infrequent water changing or from the excess nutrients from cycling a new system. Also, because it is photosynthetic, long light cycles encourage growth.
The best way to get to battle cyano would be diligent tank maintenance. A combination of regular water changes, great filtration, not over feeding or over stocking, manual removal and good water flow. Regular water changes will help remove organics and lower nitrate and phosphate levels which are large fueling sources. Regular testing will help you keep your level in check but, keep in mind that test kits can only measure inorganic phosphorus. If any phosphates show in your testing, this means there is a higher amount of organic phosphates. Anything above 0.03ppm should be lowered asap. Also add if your using tap water it may be adding to the problem. Testing your tap water would be advised. Some tap water contains phosphates and nitrates in which case RO/DI water would be necessary for top offs and salt mixing. Other things that may help are adding more waterflow to your tank. Cyano will thrive in low flow stagnant areas. Manual removal will help as well. Siphoning the cyano from your sand/gravel and rocks with airline tubing will help remove bulk amounts of cyano. Be sure to remove any cyano that you wipe from the sides of the tank as well. Feed less. Actually, it's good practice to skip a day of feeding. Many aquarists feed every other day. Commercially prepared foods contain a lot of phosphates as well. There are several chemical products on the market that can be used to control cyano. These can be a mixed blessing. While it may control and/or eliminate your cyanobacteria, these fixes are usually temporary. Cyano being so adaptable, unless you change the conditions in your tank that is causing the problem in the first place, it will often adjust itself to the new chemicals and reappear over time.
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