Remember, a lfs, even the online ones, exist to sell you stuff. Live aquaria is pretty good about the requirements, but on some of the more popular fish, i know some of their recommendations are incorrect because they want to sell more of that product.
We are not here to sell you anything, we dont want to see you dump thousands of dollars on your tank to watch it fail because of bad recommendations. The advice we have to give, is the best we have for each situation. We want to see your fish and coral thrive.