Been reading up on brown sludge in water tanks and came across this, ive siphoned nutrient rich bacteria filled water straight into my aquarium!
Iron and manganese deposits will build up in pipelines, pressure tanks, water heaters, and water softeners. This reduces the available quantity and pressure of the water supply. Iron and manganese accumulations become an economic problem when water supply or water softening equipment must be replaced. There also are associated increases in energy costs from pumping water through constricted pipes or heating water with electric heating rods coated with iron or manganese mineral deposits.A problem that frequently results from iron or manganese in water is iron or manganese bacteria. These nonpathogenic (not health threatening) bacteria occur in soil, shallow aquifers, and some surface waters. The bacteria feed on iron and manganese in water. These bacteria form red-brown (iron) or black-brown (manganese) slime, often detected in toilet tanks, and can clog water systems.
Potential Health Effects
Iron and manganese in drinking water are not considered health hazards. In addition, iron and manganese bacteria are not known to present a health risk.