Never used it myself however I have found this on caribseadotcom website:
For marine and reef aquariums, add 1 drop per gallon or 1ml per 10 gallons.
For larger aquariums add 1 capful (5ml) for each 50 gallons. aragaMILK™ is safe enough to use daily if needed or until target alkalinity is reached.
Adding aragaMILK™ in the morning is suggested or at least two hours before the lights are turned off.
To prevent precipitation of carbonate mineral, do not add at the same time as, or mix with, other calcium, magnesium, or buffer products.
Every aquarium is different. Some systems may require multiple doses to reach target alkalinity level (natural seawater is 3.5 meq/L). Wait at least two hours after dosing, and test alkalinity, before repeating dose.
Long term stability of alkalinity is achieved with regular use. Your aquarium may take on a slight haze while the aragonite crystals are equilibrating with seawater or imbedding within the bio-coated surfaces. This haze will typically disappear within 1-2 hours. If your tank is stocked with sessile invertebrates (i.e.: live corals, xenia, tridacnid clams, etc.), dilute aragaMILK™ into a larger volume of water first, then add to the tank. For example, dose aragaMILK™ into a clean, (not soapy), cup of aquarium water, mix well, and then pour slowly into the aquarium, (ideally into a sump, near powerheads or filter outflow for rapid dispersal). This method prevents any unwanted “settling” of carbonate salts onto delicate corals or other live invertebrates
As has already been said, aragaMILK is for use in marine/reef tanks and not freshwater so I personally would completely disregard the use of it.
