02-12-2009, 08:33 PM
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either there, or tucked in a corner of your display somewhere (another thing a sump is good for!). What kind of macroalgae is it? cheato, caulerpa, etc... I think macro is best used in an area of slow, constant flow, so there might be more flow than would be ideal in your skimmer.
Also, the macro will need light to grow (like any algae!), does a significant amount of light from the tank make it inside the skimmer where the media chamber is? If not, I wouldn't suggest you put the macro in there, as it will wilt and die in the absence of light.