Marine trace supplies a broad range of trace elements demonstrated to be necessary for proper fish health and growthr unlike terrestrial animals fish obtain nutrients from both their food and environment trace elements are normally depleted by utilization oxidation and precipitation thus it is important to restore them on a regular basisr marine trace contains only those elements actually demonstrated to be required by fishr directionsr use 1 capful 5 ml for every 80 l 20 gallons onc