As you’ve seen, there are 10 millimeters in a centimeter. Similarly, there are 1,000 millimeters in a meter and 1,000,000 millimeters in a kilometer, which is 1,000 meters. Once you understand the math, converting other metric measurements to millimeters is a relatively simple task. The prefix “centi” means “hundred,” signifying that a centimeter is one hundredth of a meter. By the same token, “milli” mean “thousand,” so a millimeter is one thousandth of a meter. You may need a calculator for this one. Start by entering your inch measurement up to 2 decimal places (as in “6.25”). Then, hit the “x” button and punch in “25.4,” as there are roughly 25.4 millimeters in 1 inch. When you hit the “=” button, the number you get will be the same measurement, only in millimeters.  Using the formula described above, 6.25 inches is equal to 158.75 millimeters. Translating inches to millimeters is a little tougher than making other conversions, since inches are imperial units and millimeters are metric. The idea here is the same as converting inches to millimeters. There are approximately 304.8 millimeters in an imperial foot, so multiplying the total number of feet by 304.8 will help you determine how long it is using the smallest metric unit of measurement. If you’re 5 feet tall, you would be 1,524 millimeters tall. That sounds a lot more impressive! Nothing new here. 1 yard is equal to about 914.4 millimeters. As a result, multiplying a yard measurement by 914.4 will instantly turn it into a millimeter measurement.  The same basic principle that makes it possible to convert inches and feet to millimeters also applies here. There are 12 inches in 1 foot, so 12 x 25.4 = 304.8; a yard has 3 feet, so 304.8 x 3 = 914.4, and so on. It’s well known that the field of play on an American football field is 100 yards. What many might not know is that this amounts to a whopping 91,440 millimeters. Imagine trying to measure that out with a ruler!
++++++++++
One-sentence summary -- Learn how other metric measurements work to easily calculate millimeters. Multiply inch measurements by 25.4 to find their length in millimeters. Multiply measurements given in feet by 304.8. Use a conversion factor of 914.4 to get millimeters from yards.


This is the most common disease among neon tetras. The first sign is swimming away from tankmates. Affected tetras will also lose their neon stripe and develop spots or cysts on their dorsal fins. As soon as you recognize early symptoms, relocate the sick fish to a quarantine tank immediately. The disease is almost always incurable, but it never hurts to ask the vet for advice. It's normal for neon tetras to become dull in color at night. This is the result of special skin cells called chromatophores taking a rest. However, if the dullness continues during the day for several days in a row, the fish may be ill. Ich is a highly contagious parasite that takes the form of small white cilia-covered spots on the fish's body, which look like salt. To fight it, slowly raise the tank temperature to at least 86 °F (30 °C) for three days. This should kill the parasite.  If the spots don't disappear after three days, put your fish in a quarantine tank and add cupramine (copper solution) to the water. Follow the instructions on the label. Keep the copper levels at 0.2 ppm. You can measure copper levels with a salifert test kit that you can buy in hobby stores.  Kill the Ich in the original tank with aquarium salts, which you can buy in pet supply stores. Add one teaspoon (5 g) per gallon (4 L) of water every 12 hours for 36 hours. Let the salt remain in the tank for 7 to 10 days. If you have plastic plants, aquarium salts will melt them. For the sake of your tetras, toss the plants. Unhealthy neon tetras can also develop skin flukes, bacterial infections and diseases, and parasitic infections. Talk to your vet or read books that detail the symptoms and treatments of all diseases your fish might develop. In many cases, catching the early symptoms and taking immediate action can save your fish.
++++++++++
One-sentence summary --
Quarantine fish with Neon Tetra Disease. Treat Ich through environmental changes and medicine. Research other diseases.