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Using the equations and correction factors a table is easily set up for the “average” fish. Researchers have compiled lists of the weights of very many fish and set up an equation to calculate the weight of the “average” fish. A five inch discus (including tail) which is 3.5 inches high and 3/8ths of an inch wide is 5×3.5×0.375=6.6 – 6.6×10= 66 grams.a “normal fish” a five inch peacock (including tail) is 5 inches by 1.5 inches tall by half an inch wide gives 5×1.5×0.5=3.75 – 3.75x 10= 38 grams.Each calculated cubic inch is 10 grams of fish. One surprisingly accurate way to tell the weight in grams is to multiply the length by the width by the height in inches (I know, we’re mixing measurement systems but that the rule!). The only missing piece is the weight of the fish. Melanochromis chipokaeĭepending on what your goals are for your aquarium, only ammonia oxidation or crystal clear, healthy water, one can now calculate the media needs for any given aquarium. If you feed your fish per the directions on most fish food containers (“ what they can eat in five minutes three times a day“) you will need like ten times the media. Obviously if one uses a 3% feeding (juvenile fish) load will require twice the media. It has to be emphasized that these tables apply for fish fed at a 1.5% feeding load of typical commercial dry fish food. These last three media have a 75% penalty for being very slow lamellar flow. We’ve added 30 ppi and 20 ppi sponge filters and an undergravel filter gravel as media. Most of the media represent what a media will do in a canister, sump or hang-on-back filter. Biomedia surface area CRYSTAL CLEAR water This gives a considerably different table. For heathy fish and crystal clear water one wants at least 100 square feet of surface area per pound of fish. If one wants crystal clear water and healthy fish, ammonia oxidation is only a small part of the story. Biomedia Surface area ONLY ammonia oxidation The first table is based on the well established fact that ammonia oxidation needs 5 square feet of effective biomedia surface area per pound of fish. If one works all the numbers on biofiltration media in the aquarium filter you come up with two very interesting tables. Calculating Filter Media Volume Requirements