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I have read this entire thread through, and boy what a read. But well worth it. have gone ahead and started my RDSB and chose to use aragonite instead of regular sand, Partly for ease of mind, and partly because I could not be assured that the sand up here in Canada was totally safe. Now, I have a 180 tank and I bought 80 pound of aragonite hoping it would be enough. It isn't. I need another 40 pounds at least. The cost is mounting. A friend of mine told me white biomix is safe for tank use. Someone earlier in this thread was talking about mixing different types of sand. Can anyone tell me if I can use the Biomix at the bottom, and use the aragonite on top. Would this work?
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