One thing I found really intersting was going to a library and looking up all the invertebrates that live in turtle grass beds. There are a bunch of corals that are naturally from them (some that aren't very popular in reef tanks but are very hardy).
There is this one coral that doesn't always attach to the substrate but rolls around. You can find it with polyps all the way around! I forget what it is called but I will look it up.
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