I can't remember a time when I didn't keep macro algae. My first marine tank did not have a sump so I grew halimeda which is an attractive algae. Then I got a hang on refugium, and grew macro algae in it. Finally I got a sump and things took off from there. But, growing macro in your sump comes with problems. You have to have a light source for one, but that's minor.
The real issue is that bits...
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