I leave mine brew until I can't see through the 2 litre bottle 2-3 weeks. Then shut off the air and let it sit in a cool place and settle for a couple days. Pour off the thin stuff on top and use it to restart the next batch and put the concentrated stuff in the fridge for the tank. If you really care florida aquafarms sells some sort of meter to give you a density, I think it is a colorometer(or something like that). They are around $10 bucks so should only cost around $100 to have it at your door,lol.
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