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For a FO tank = whatever you can get for a good deal. Mix it to the correct salinity and pH and you are fine
For a Reef Tank = you are going to want good Ca and Alk of course. I am a bit leery of Seachem and the Borate thing as well. As far as I know the coral cannot use the Borate which helps keep the Alk elevated... therefore there is less Alk available for the coral to consume??? Then when you test the water the test kit tells you that you are good with Alk but the corals are starving for more??? *shrug*
I like mixing Oceanic and Reef Crystals for my reef tank. The Oceanic has pretty good levels of Ca so that helps me not have to add that later to the fresh mix.
Also I remember reading a long while back that freshly mixed salt water is pretty caustic and is not good for coral and fish. I always let my newly made saltwater circulate in the Brute can for 24 hours before it goes into the tank.
For a Reef Tank = you are going to want good Ca and Alk of course. I am a bit leery of Seachem and the Borate thing as well. As far as I know the coral cannot use the Borate which helps keep the Alk elevated... therefore there is less Alk available for the coral to consume??? Then when you test the water the test kit tells you that you are good with Alk but the corals are starving for more??? *shrug*
I like mixing Oceanic and Reef Crystals for my reef tank. The Oceanic has pretty good levels of Ca so that helps me not have to add that later to the fresh mix.
Also I remember reading a long while back that freshly mixed salt water is pretty caustic and is not good for coral and fish. I always let my newly made saltwater circulate in the Brute can for 24 hours before it goes into the tank.