This product ships as a small quantity of dry powder in a bottle. You must follow the directions on the bottle to mix the appropriate amount of water into the bottle to turn the Methylene Blue into a liquid medication. It may seem that your bottle is empty when you receive it, but it is not.This medication is a general disease preventative for both freshwater and marine aquariums. It also prevents fungal infections on eggs and newly hatched fry. After mixing water into the bottle with the powder to form a liquid medication, the doseage is 1 teaspoon per 10 gallons. 32 oz.4 oz. treats 240 gallons.
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