One of the main differences I notice in Fowlr is a lack of corraline, making the whole tank look very brown and dead, I assume this is mostly because not many people bother putting reef lighting over it or dosing calcium. However if you put some t5s over it, dosed a bunch of purple up and bought fast growing hardy corals, ie mushrooms, xenia, gsp, you could brighten up a fowlr pretty good, depending on what coral your fish decide to munch on.