01-29-2007, 05:25 PM
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There are rules about adding salt though. If you take out, lets say 10 gallons of old aquarium water, but you add in 11 gallons of new salted water due to evaporation, your salt levels will start to rise.
If you take out 10 gallons of old water and add 10 gallons of new salted water, then add 1 gallon of reverse osmosis water (pure water, no disolved metals or salt) then you should be fine.
You wont need to add much salt in if it is for long term use. I would suggest 1 tsp per 5 gallons but ask someone else before you add.