artificial coral reefs

I'm not sure what is your point here.As jar says, we have been creating artificial reefs for a very long time. It is well known that this can alter natural habitats, and can alter ocean current flows. Sometimes these changes will provide new habitats, sometimes they might destroy old habitats. It isn't always easy to predict what will be the effect. Personally, I don't think this has much at all to do with the evolution vs. creation debate. But you started the topic. Why don't you tell us why you think it is relevant to the debate.

This is a very sensible view, in my opinion.What I don't understand, is how you are connecting this to "artificial coral reefs", which are what we should be discussing in this thread.