If you have a wet/dry filter, you don't really need the Fluval 404 unless you want to run carbon in it from time time to polish the water.
I would get some reef rubble and replace the bio balls in the wet/dry system. Over time, bio balls have been known to increase nitrates.
If it's a fowlr
your after, then all you need is the wet/dry with reef rubble, a good skimmer, and plenty of lr
. Also, make sure you have adequate flow from powerheads etc. Other than that, you should be good to go.