Is the 42% protein food giving crystal clear water? Or is it giving “dull” water or even slightly cloudy water. A level of 42% protein in the dry commercial fish food won’t be “ideal” but it also won’t be that bad. In truth there is a continuum between 30% and 60%. But the “45% protein” level is completely arbitrary. I make the cut-off at 45% for dry commercial fish food. Now everyone wants to know what defines a low protein food. These pathogenic bacteria and other organisms in the water column attack the fish.The proliferation of these organisms in the water column results in “dull” or even slightly milky water.Pathogenic bacteria and other pathogenic organisms proliferate with high carbon to nitrogen ratio DOCs.The undigested carbohydrates create dissolved organic compounds (DOCs) that have a high carbon to nitrogen ratio.Carbohydrates are only 50% digested by the fish.A low protein food typically has a high carbohydrate content.Rather its effect is indirect, through a long line of causal effects: Low protein food does not directly produce unhealthy fish. In turn, crystal clear water gives very healthy fish. Higher protein food is a significant factor in creating crystal clear water. Rather the effect is due to what high protein food can do to the ecosystem that is in any aquarium. But this effect is NOT because eating high protein food is good for a fish. The higher the protein level in any food the healthier the fish. The most important variable when choosing a fish food is the protein level. Index for Aquarium Fish Food A Caveat: Protein Level in the Food

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