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Huge +1 on not using the sand. You would need to rinse it and the amount of saltwater needed plus the time is probably more expensive and annoying then just adding new sand. Also the things that can get stirred up can kill all your fish and can't rally be tested for. Dr. Tims one and only is a...
I asked my question wrong, what I was really getting at is why did you want to run it in the first place? I am admittidly ignorant on the subject, but I don't think I have talked to one person or store who had endorsed it. At a quick glance, it seems rather complicated and potentially harmful...
Welcome back and good luck with the build. Custom king on MR builds custom sumps, you might want to look at some of his designs to see what he has done with smaller stands. What are the dimensions of the tank and stand?