Piranhas and Snakehead fish

Piranhas will be a wonderful new mob for mangrove swamp. they will attack hurt mobs, but they won't attack mobs if they aren't hurt. they drop raw piranha that can be cooked and eaten and piranha tooth. they will move with small groups.

Snakehead fish will be a neutral mob. they attack most of water mobs, such as frogs, tadpoles, axolotls or cods. they can walk on land when it's raining or the floor is mud or clay. they drop raw snakehead fish that can be cooked and eaten and leather.