Problem: Article: Rainbow sharks are not particularly large, only about 6 inches (15cm). However, they are semi-aggressive and very territorial. These fish need plenty of space and hiding spots to prevent confrontations. You might be required to assemble the aquarium. Follow the instructions on the box, because these will vary from tank to tank. Purchase a heater and filter to go with the tank. Be sure that the filter is designed for a tank of your size. Refrain from using an under-gravel filter, because it is not compatible with sand, which is the optimal substrate for rainbow sharks. You should also purchase a tank stand designed to accommodate an aquarium of your size. While it might be attractive to use a table or desk that you already own, these often will not be strong enough to hold a heavy tank. Similarly, putting an aquarium on the floor is very dangerous. The tank should be placed far away from environmental factors that can cause large variations in temperature: windows, air conditioners, radiators, and air vents. It should also be located away from noise and foot traffic. Avoid spots near doors, on the floor, or in a busy hallway. You should also try to find a place that is near a power plug, a water source, and where you have space to both work on and observe the tank. Gravel with sharp edges can scratch up and damage the rainbow shark. Very fine gravel or, even better, sand should be used as a substrate. Because the rainbow shark is territorial, you will also need plenty of places for the rainbow shark to hide. Caves, tubes, and other tank decorations sold at pet stores can help prevent conflict between territorial fish. You should also purchase live plants for the tank. These are a good source of distraction for fish and help to keep the tank clean. Tap water should be fine for your shark, though you will need to treat it. Fill the tank near to the top, but leave a few inches of headspace. It is necessary to keep a layer of oxygen at the top of the tank. Once you introduce the shark, you'll need to keep the tank covered with a lid to prevent the shark from jumping out. Tap water usually contains chlorine and other substances that are harmful to your fish. You can purchase a water testing kit at the pet store to determine what chemicals you'll need to make the water safe for your shark. You will probably need a sodium thiosulfate solution to treat chlorine and Amquel to treat chloramine. To get more information about the chemicals in your water supply, ask the local pet store owner or call the water utility directly. In addition to adding sodium thiosulfate and Amquel to the tank, treat the tank for pH levels. There are a variety of acids and bases that can be purchased at the pet store to adjust the pH level in your tank. Test the level and adjust the pH until it is in the range of 6.5 to 7.5 pH. It is important to allow time for the water to cycle and for the chemical composition of the water to stabilize. Continue to closely monitor the chemicals to verify that they are at safe levels. Rainbow sharks like a water temperature from 72-79 Fahrenheit. To keep the tank at this temperature, purchase a heater to go with your tank. Set the heater somewhere between the 72-29 degree temperature range. You should also be sure to keep your aquarium away from anything that could cause it to suddenly change temperature. For example, keep it away from windows, heaters, and vents. Even a shark cannot survive more than a couple of hours in the bag that the pet store gives you to bring it home in. When you bring the fish home, float the bag in the aquarium water for half an hour so that fish can adjust to the aquarium's water temperature. You can add some water from your tank to the bag to help the fish get used to the new water. Then use a net to transfer the fish into the tank. Discard the old water instead of adding it to the tank, since the waste in the water makes for an inhospitable environment.
Summary: Purchase an aquarium that can hold at least 50 gallons. Find a safe location for your aquarium. Put sand and hiding places on the bottom of the aquarium. Pour water into the tank. Treat the water. Allow the water to sit for two weeks before introducing fish. Keep the tank at a moderate temperature. Move your shark to its tank soon after purchase it.

Problem: Article: This seems pretty easy, and it is. Still, a little politeness can go a long way, and your teacher will probably enjoy the interaction. This can work either in the classroom, or if you see your teacher somewhere else in the school, or even out in public. Make sure you are aware of time and place when you meet. If your teacher looks very busy, or in a hurry to get somewhere, don't stop for a long conversation. A quick hello is all you will need. Anything more will just be annoying, and won't help you. If you're interested in the material, go ahead and talk to your teacher about it, or related topics that interest you. Your teacher wants to create enthusiasm for the subject, so anything you can do to show you are interested will make his day. When you go talk to your teacher, make sure you have something in mind to discuss. Teachers are busy people, and won't want to sit around if you have nothing to talk about. A specific question like "I still don't understand this topic" can help keep you focused and give the teacher something to respond to. A non-specific or blanket statement like "I'm confused" doesn't help either of you. You can also mention something interesting that is related to the class, maybe something else you've seen or read that seems familiar. For example, if your teacher was explaining a scientific principle, mention that you saw something similar in a movie, or the news, and ask if it is the same thing. It shouldn't be big or special, just a way to suggest you appreciate their effort and like the way they are teaching. Just be careful not to do this too often, or it will look really obvious that you are trying to suck up. The gift should be something small. Consider getting a gift card or even something you make yourself. A small handmade card or crafty item is more personal, and will help the teacher remember you. Something that reminds you of the lesson you just had can be good, as it tells the teacher you were paying attention. Avoid stuff like mugs or candles. Teachers will get lots of stuff like that, meaning your gift won't stand out and be memorable. Remember to get gifts for holidays, especially Christmas. Other students will probably be getting your teacher a gift then too, so it won't look too obvious that you are sucking up. Plus, you'll definitely look better than those kids that didn't get the teacher anything. This is a way to tell the teacher he is doing a good job, so if you are enjoying it, let him know. You want to make sure you have been paying attention to the class. If you haven't been, and the teacher has noticed, he won't take your compliment seriously. This doesn't have to be a long conversation. As you leave, start by telling the teacher "I really liked it when we" and mention something that you found interesting. Close by saying something like "That was fun" or "I really get that idea now," which tells the teacher he did a good job.
Summary:
Say hello to your teacher. Ask questions outside of class. Get the teacher a gift. Tell your teacher you like the class.