Originally Posted by teen
who died and made you mod?
i just got back from the beach. i collected 12 gallons of water to do a water change in my 30 gallon. been doing it for awhile now and havent noticed any probelms, if anything, things look better than synthetic mix. i wouldn't hesitate to buy pre packed water from your LFS. and you can always switch between synthetic mix and natural.
Ok let me go back.. You can switch between the 2 however there are serious things to consider before you decide to use natural sea water in your system.
The strongest point against real seawater is that it "dies", both biologically and chemically more quickly than synthetics. You must change part of the water more frequently. Many mixes should be changed just as frequently, but often, especially in terms of appearance (yellowing) you can "cheat" more than with natural water.
Another issue with natural water is that it comes with micro- and macro-organisms. Even if the water is filtered, diatomed, U-Ved, ozonized etc// many organisms will survive. Natural sea water is excellent, but depending on the source it has the potential for contaminants. When you consider the work involved in preparing natural sea water for aquarium use, as recomended. (not many people do that) you may be better off with a good brand of synthetic salt mix.