Different favias like different things. My Fascination hated light. Fat, puffy, and gorgeous colors in full shadow. My Top Fuel liked a medium light, my Reverse Prism Favia both like medium-low light. Favia are weird and picky. I think part of it is there are so many different varieties of type - not just color - and each one is from a different part of the reef. They're all classified as Favia even though they're agressive to each other. For example, my Top Fuel was most likely a Favites and my Reverse Prism and Fascination are all three likely different species of Favias. There are some subtle differences between the 3 and it's more easily noticed between the two Reverse Prisms but still subtle.