Hi, Welcome to the site!
I agree with what Beaslbob said...but adding a Little detail: Your wet/dry is just fine...instead of the bioballs, convert the chamber into a refugium, and add a little light over it. Then keep an inch of sand, a few small pieces of live rocks, and macroalgea in it. You won't have to worry about nitrates or phosphates, and you won't even need a skimmer.