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I have this "hitch hiker" coral in my nano tank. Someone mentioned that this could be a sponge. I couldn't find any sponge coral photos online that looks like this.
pic isn't very well focused when blown up to this size. it's pretty small and quite attractive. I am inclined to think it isn't a sponge. It looks more like..... leather corals...
This is what I found under red leather corals - looks awefully alike