Don't forget GSP and Xenia. Most predators don't bother with corals anyway, they are typically carniverous. Some like to move liverock around but it doesn't matter with shrooms and the two I previously mentioned. I had a beautiful Auriga butterly who loved to eat Xenia, it still grew faster than the Butterfly could consume it.
There are some decent types of macro algea such as Halimeda which is not too invasive as well.
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