Yeah realistically you want to aim for 1 inch of fish per 5 gallon. the hippo tang is a definite no go as is the niger trigger as these would be too big and the niger is not reef safe. the copperband is just too bag and although may do ok in the tank it is a difficult fish and not really reef safe espescially with anenomes. the sailfin would also be to large for the aquarium. angle fish are also not great reef fish due to their tendancy to nip at corrals.
on the plus side the clowns, yellow tang, fire fish, royal gramma, midas blenny will all be fine in there but that would probably be about all you would want to add int he first 12 months anyway