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I think it can be tricky balancing both. Corals actually utilize a lot of the same major and minor elements that macroalgae need, so there could be competition for those. Also, if you are keeping the faster grower macroalgae like caulerpa or ulva in a mixed reef, they could easily take over the tank and cover up coral. If you want to add in macroalgae into a reef tank display, consider some of the red macroalgae (gracilaria hayi, dragon's breath) which won't stick to everything as easily or slower growing green (e.g., halimeda, pencil cap, mermaid's fan) or brown macroalgae. Having said all that, I know of other hobbyists that keep both just fine. I've tried it myself with mixed results given I like to keep nutrients pretty high for macroalgae and they often will overgrow coral very easily without regular trimming (so I've shifted away from putting coral in my tanks).what are your thoughts on adding some macroalgae to a reef tank? Are parameters too different? Too much competition?