unit is then activated to begin cycling and moving the water in a toroidal pattern generally the water treatment unit is operated for a period of time sufficient to normalize the environment of the tank water before supplying the crustaceans or other fish as described previously the water treatment unit not only sufficiently aerates the tank water e g 1 1 pounds of oxygen per hour but also strips carbon dioxide and biological byproducts from the tank water and removes them from the system to increase the growth rate of bacteria a sufficient amount of ammonia nitrites and or nitrates may be added to the tank water samples of the tank water are taken to measure various aspects of the quality of water to ensure that the tank water is ideal for growing crustaceans or other fish a plurality of shrimp quantity of about 12 000 to 15 000 with an average weight of about 1 gram is placed in the tank water the shrimp are fed several times of day e g 3 times a day with a sufficient amount of feed typically associated for growing shrimp such as from zeigler 39 s bros inc gardners pa after 6.