I can see alot of time was put into making this chart, but.......
A source of reference would make the chart alot more valid. Is what you put in there your opinion or what was written somewhere? I see you listed a few leather corals as high light? You listed a few I can't say I totally agree with.
Putting the actual species of coral would help alot too. What's the difference between a branching acro, a finger acro or a spiny acro? Is there actually a difference between a bulls-eye mushroom, a purple bulls-eye and a green bulls-eye that they all need to be listed seperately?
I think this chart can be a good idea, but fine tune it some. Adding references and using scientific names, IMO, will make the chart a bit more valid.