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Your sea monkeys need oxygen to live happily in their tank. If they become oxygen deprived, they may turn a pinkish color and appear slow moving or tired. To ensure the water has enough oxygen, you should aerate the tank twice a day, once in the morning and once at night. You can use an air pump to aerate the water, such as an air pump used in small aquariums. Stick the air pump in the water and let it aerate the tank for at least one minute, twice a day.  Another option is to use a small turkey baster to aerate the tank. You can squeeze the turkey baster in the air and then put it in the water and release the air to put more oxygen in the water. Pull the turkey baster in and out of the water, placing air in the water, for at least one minute, twice a day. To make your own air bubbler: Take a pipette that you aren't planning on using for anything else. Poke a hole in the very top, then poke many tiny holes in the squirting-out end. Either use a pin or staple it several times from different angles with a stapler, then remove the staples. If you do not want to remember to aerate the tank twice a day, you can place a small live plant in the sea monkeys’ tank to provide oxygen in the water. Use an underwater aquarium plant that is known to provide good oxygen underwater. Sea monkeys do not like being in a very cold environment or a very hot environment. You should put their tank in a spot of your house that gets indirect sunlight and is at least 22 degrees Celsius, or 72 Fahrenheit. This will ensure the tank gets enough heat and is not too cold for your sea monkeys. A tank that is too cold will lead to them becoming immobile sea monkeys and sea monkeys that do not grow. If you notice the sea monkeys are not moving in their tank or growing, it could be because the tank is too cold and needs to be moved to a warmer spot in your home. Place it in a spot with indirect sunlight so it gets enough heat but does not get too hot. Green algae in the tank is a good thing, as the algae acts as food and provides oxygen for your sea monkeys. But if you notice the tank smells really bad and the water appears dark and cloudy, you may need to clean the tank and the water.  You will need a coffee filter and a clean glass filled with unchlorinated salt water. Use a net to take the sea monkeys out of the tank and place them in the clean glass with water. Place the coffee filter over a clean tank and run the tank water through the coffee filter several times. Try to filter out as much of the gunk in the water as possible. You can use a paper towel to clean out the bottom and sides of the tank. You can also use a Q-tip to clean out any gunk in the crevices of the tank. Smell the tank water to check that it no longer smells foul. Then, put the water back in the tank, followed by the sea monkeys. Top up the tank water with purified, room temperature water. Feed your sea monkeys and aerate the tank several times throughout the day. Then, feed them again five days later, per their usual feeding schedule.

Summary:
Aerate the tank water twice a day. Place the tank in a warm place. Do not change the water unless it smells very foul or appears cloudy.