A algae bloom is to be expected (not sure exactly why but I believe silicates and phosphates are to blame). A way to avoid this is to keep the rocks under low light for a while after its introduced to sw(not sure how long but I'm just starting to get lots of tiny coralline specks covering my rock under 1NO bulb fixture in a 20L running 24h w/ sporadic additions of reef advantave calcium). Also running GFO and/or macroalgae in addition to water changes to keep phosphates in check couldn't hurt.
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And now back to my regularly scheduled lurking.
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