Personally, I like crayfish. Novices suggest keeping Xiao Qiang (Buddha blue, white oyster, orange oyster). I don't have much experience because I don't like rice shrimp. But lobsters are really easy to raise, except for some expensive ones. Beware of fighting when raising crayfish. Shelled crayfish should be isolated (because they can fight, just shelled is a mass of meat, and basically recovered in 2 days), and raised with black sand, coral sand (or medical stone) (which is conducive to hair color and success in shelling, and death if they fail). Short-legged crayfish and rice shrimp should be raised with Ada mud, and they should be isolated if they are not beaten. Don't throw it away after shelling. Eat calcium supplements by yourself in a few days (I just shelled and lost my appetite when I was about to shell). The dwarf aojiang river can reproduce in 2cm, so it is recommended to wait until 3cm. Camouflage and dragon pattern can breed 5cm to 6cm. Xiao Qiang, Australian shrimp 6cm can breed in Xiao Qiang, 8cm is recommended, and Australian species generally recommend 10cm. Rice shrimp, I don't know. Green water farming should not work. I just bought a pair of blue sky two days ago. If you want to raise lobster, you can ask me other questions, usually online on weekends.