... Digital Timer Instruction Manual)After water pump operation for 48-72 hours, the water is clean and clear. Choose your favorite tropical ... ‘ ON’, Press Keys‘HOUR’and‘MINUTE’ set up lighting working hours. Then Press ‘SET’, Screen Shows‘ OFF’, Press Keys‘HOUR’and ... time.(Recommend to set lighting working time for 8-9 hours per day)After above setting, press Key ‘SET’, Screen shows ...