Aquatic moss is so fragile. Java moss can be easily cut off, easily squished and quickly dried out. Providing the right conditions, Java moss becomes the hardest to kill out of all the aquatic plants. There is an old saying between aquarists that once you get the Java moss in there is no getting it out and that is definitely true. Java moss is one of the fastest growing aquatic moss and once it thrives there is no getting rid of it from your aquarium. An aquarium can suddenly find itself having a lush Java Moss growth months after the original plant had been removed.