Problem: Article: You can often find crayfish for purchase at marine shops that sell tropical fish, as well as some pet stores. Before you start shopping around, do a little reading on the different species and their individual needs. It’s a good idea to start with a single crayfish until you have an understanding of how to properly look after them.  Crayfish usually go for $20, or more. With the rarer varieties, they can for $30 or even more! In some parts of the world, you can catch crayfish in streams or other shallow bodies of water. Just grab a small net and start hunting under rocks until you spot one that will make a suitable pet. to house your crayfish. Generally speaking, the tank you choose should be large enough to hold at least 5–10 gallons (19–38 L) for each crayfish inside. However, a 15–20 US gal (57–76 L) tank is ideal, especially for larger varieties. An air bubbler or long bubble wall is also a must, as it’s possible for crayfish to drown if they stay submerged for too long without a separate source of oxygen.  Crayfish thrive in cool conditions like mud flats and riverbeds, so stay away from heated aquariums. Look for tanks that feature built-in aeration and filtration units to keep the water clean and circulating properly. Crayfish prefer water with a neutral pH (around 7.0). Ideally, the temperature of the water should remain somewhere between 70–75 °F (21–24 °C). You should have no problem keeping the water at the right temperature if you’ve set up your tank indoors.  A pH testing kit can come in handy for determining how acidic or basic the water in your tank is. You can typically find these kits in the fish section at pet stores, or wherever pool supplies are sold. Avoid adding objects like seashells to your tank, as foreign minerals can throw off the pH of the water. e tank at least once a week. Crayfish generate large amounts of waste products that can be taxing on standard aquarium filtration systems. This means you’ll need to stay on top of your water changes in order to ensure that you crayfish enjoys a clean living environment. To change the water in your tank, first drain ¼-½ of its total volume, then slowly top it off with fresh, clean water.  If your tank doesn’t have a filter, it may be necessary to increase the frequency of your water changes to twice a week. Stick to mounted tube or sponge filters only. Crayfish like to dig, which can end up jamming undergravel filters. Add elements like rocks, water plants, or lengths of PVC pipe to the bottom of your tank. That way, your crayfish will have a place to play, burrow, or hide away for a while. Large structures like hollow rocks, gerbil tubes, or enclosed containers are particularly good for making crayfish feel safe, especially during their vulnerable shedding period. Shut off any surrounding light sources or keep one side of the tank covered to minimize the amount of light that gets in. Crayfish like it dark.
Summary: Buy or catch a crayfish. Set up a tank Fill the tank with fresh, well-balanced water.  at least once a week. Incorporate a few natural environmental features.

Problem: Article: The world is gonna do all it can to force you into the mold it wants. It's gonna tell you what's practical and what's acceptable and just dare you not to listen. Don't! Do you want to move to New York, be a go-go dancer, and eat only Ramen noodles for the rest of your life? If so, go for it. Those who matter don't mind and those who mind don't matter, after all. Find a passion. Everyone is better with a passion. And stick to it! If the world mocks you for it, you're in the wrong group of people. You're at your best when you're happiest. Seek your passions, regardless of what others think, do, or say. Being selfish the right way is an art. It is the ability to discern when what's best for you is still what's best for the situation at hand. It's knowing when your desire of something isn't really justified versus when it means being content with your life. If you refuse to let your friend pick the movie you go to, you're being controlling and selfish. If you don't go to her dance recital because you picked up another shift at work to pay the electric bill, you're being logical. Know the difference. This isn't just with others -- this is with you, too. There will be times in your life when you can be selfish and times when you straight up shouldn't be. Do you really want to move in with this guy you met online who lives on the coast of Australia? Or should you take that opportunity to work with the Habitat for Humanity who's offering you a hefty scholarship for college? Sometimes what's best for you isn't what you want -- but will be what you want down the line. Sometimes it's best to just shut out the world for a moment and have some well-deserved me time. Sometimes it's the only remedy! Take a bit of time each day -- whether it's at home, work, or on a run -- to just do you. Destressing is important for all your daily activities. You're just improving your productivity! Try meditation, yoga, or simply go for a walk. If that's not an option, take 10 minutes at your desk to daydream. The downtime will energize you for the rest of your obligations and give you much needed focus. Humility is practically shoved down our throats, isn't it? Someone offers you a compliment and you're taught to say, "Aww, no, it wasn't that good. Plus, so many other people helped me." Don't do it! Relish it. Accept it. You've earned it! We all need to give ourselves a pat on the back once in a while. And if others do it for us, great! Those people want to compliment us -- let them! They wouldn't go out of their way if they didn't want to. Friends are getting together for pizza and beer on Thursday night when you promised yourself you'd go the gym, but they're depending on your place for the large screen TV? Too bad. You have plans that you don't feel like breaking. They can do their thing elsewhere. You have calories to burn! It's fine to be an inconvenience. If your friends are ordering pizza and you're vegetarian, speak up! Tell them you want -- no, demand -- a veggie supreme. They're desire for pepperoni is no more important (in fact, less so) than your dietary constrictions. Thanksgiving coming up? Well, let them keep the turkey, but come up with your own alternative! Compromises can easily be had.
Summary:
Do what fulfills you. Pick your battles. Choose "me" time. Be proud of your accomplishments. Be selfish with your body.