Q: 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 86F (30C) 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.
A: Quarantine fish with Neon Tetra Disease. Treat Ich through environmental changes and medicine. Research other diseases.

Q: This cylinder can be either glass or plastic, and should be at least 12 inches tall. The shape is important: if the top is wider than the bottom (or narrower) it will require much more calculation and measurement. It doesn't actually matter how wide container is, so long as it's the same diameter all the way through. As the volume of the container gets biggerfrom say, a coke can to a mop bucketso does the area which collects the rain. Because of this, one inch of rainfall will be recorded consistently between cylinders of varying sizes. If you don't have a cylinder on hand, you can make an equally effective gauge with an empty 2-liter soda bottle and little work. Using scissors or a knife, cut the top 4 inches of the bottle off. Don't worry about the uneven bottom of the bottle. That will be taken care of in the next step. Because rain will often be accompanied by wind, you'll want to steady your gauge so that it can stay upright through a storm. Fill the bottom with pebbles or marbles, but don't go higher than an inch or so. Once that's been done, you'll want to fill your container with water, to provide a level starting point for your scale. Your weights will be taking up volume, and so we don't want them included in the measurable area. Rocks, stones, marbles: any small, relatively heavy objects will do, as long as it won't absorb any of the water. If you've created your own gauge with a soda bottle, make sure the entire bottom (the four separated points of the base) is filled with water and stones, to provide a flat starting point for your scale. As an alternative to placing pebbles in your gauge, you could place it within a sturdy container, such as a heavy bucket or flowerpot. This can be done with a waterproof sharpie. Hold a ruler or measuring tape up against your bottle, and line its zero up with the current water level of your gauge. Your scale's zero should also be at this water level. If you've opted to go pebble-free and are going to place your rain gauge inside a flower pot, you won't have any water in your gauge yet. In this case, zero will be at the bottom of your container. You need level ground to lessen the chance of your gauge tipping over. Ensure your gauge has no obstructions above it, e..g trees or eaves, as these will disrupt your measurements.
A:
Find a clear, cylindrical container. Make a container. Weigh your gauge down with pebbles. Inscribe a scale upon your container. Place it under the open sky, on level ground.