You bought a blue arowana, put plastic pots can be, but in the plastic pots certainly is no filtration system, if you can add a system for breeding that would be better.

If you don't have any equipment, you'd better change part of the water in the tank every day, and the water should be sun-dried one or two days beforehand, and it's better not to use tap water directly. There are also plastic pots whether deep enough, crayfish have the habit of escaping. In addition, the shrimp is afraid of heat, not afraid of cold remember. It is best to buy the ordinary small aquarium 10 dollars, shrimp is omnivorous, basically eat anything, better to raise.