Well, for a 75gallon tank...expect to spend big money. Figure $400 for live rock. $200-$300 for a nice skimmer. You have enough lighting for a Fish Only with Live Rock tank (FOWLR
) but if you wanted a reef tank, you'd need some actinic03 bulbs, and probably have to add another 2x55w bulbs (depending on if you wanted high light corals).
I wouldn't use the wet/dry filter. Use the fluval but only run carbon it in...your live rock IS your filter.
I'm not trying to scare you out of saltwater...I'm trying to prepare you for the sticker price of a 75gallon reef tank. The tank and stand end up being the cheaper purchases for a reef setup.