Use this building as a tutorial to build your own farm of prismarine shards and prismarine crystals. He won't be able to be placed without first finding an underwater temple. The sand of souls on the temple kills the fish and acts like a water tower. The farm also collects salmon, cod and black ink. It is most advantageous when the farm is square. Do not wear shoes with frosty walkers, because the water drops after melting the ice will be even on a flat surface. Sorry for unsightly photos. In the file, the earth was turned into glass. The plot block was also replaced with glass in single player mode.