Quote:
Originally Posted by sassyfrassy
I'm setting up a new tank in which I will have macros. Should I put miracle mud or some similar substrate under the sand? #2 my red gracelaria is bleaching and turning green in spots. Why?
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I wouldn't worry about using mud. It is only useful for plants that need nutrition (or at least utilize it) at the substrate level--seagrasses for example. Macroalgae will largely use dissolved nutrients in the water column.
As far as Gracilaria changing color, it is common under brighter lighting regimes. Dramatic changes can also be related to nutrients. Red colors often need lower light to be retained, though at a sacrifice to faster growth.