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<Mmm... yes... the easier-mixed material on the bottom either by itself or blended with other material (calcareous is better to reduce the chances of too-much reduction/acidic chemical behavior and its consequences), with some less-voluble material on top...
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I figured it would be good for critters. Is there any preferred order in layering a substrate for the fuge?
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- Also, my LFS said the six-line must go because he will hog the rotifers from the mandarin, so I will move him ...
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- More so since there is light in fuge ~12 hrs a day.