Check the listing for details. Blue Life USA Flatworm Control .25 oz. Condition: New. Listed at 22.14 USD. Flatworm Rx:Benefits:Flatworm Rx is an exceptionally fast and effective treatment for Flatworms in saltwater aquariums. This innovative product contains no chemicals, medications or pesticides. Flatworm Rx is safe for both reef and fish only aquariums.Directions:Siphon out as many flatworms as possible before dosing. Add 4 drops of Flatworm Rx for every 10 gallons (37.9 liters) of water. Do not dose more than one treatment in a 24-hour period. For best results, add in high flow areas one drop at a time. Do not stop the use of carbon or protein skimming when adding this product. Flatworms are extremely toxic to aquarium inhabitants. It is very important to do a 25% water change once results are visible. Siphon out as many of the flatworms as possible when performing the water change. Repeat treatment as necessary.