My lighting is very basic.... (3) 24" 65 watt power compacts
I have a barebottom tank which I have probably 140 lbs of live rock.
I change 10 gallons of water weekly, sometimes more.
I use a protein skimmer which in a fowlr is your best friend. Though I need a stronger one myself. But a skimmer of some sorts is better than none. Mine is a Przm pro deluxe rated up to 300 gallons. I wouldn't even try it on a tank of that size, but on my 125, it works pretty decent. Get an oversized skimmer, the best one you can afford. Period.
I also use two aquaclear 110 hang on filters which are rated for up to 500 gph. I use no sponge as they harbor nitrates. I have eachone filled with live rock rubble. As much as i can stuff in there and the smallest bits and peices I could find. Excellent addtional bio filter if you ask me. I have on each side of the tank.
My main bio filter is my live rockwork itself. I use (2)koralia 3's and (1) koralia 4 and point them directly into the rock work.
I also use activated carbon in a sleve that comes equipped in the skimmer itelf. I use this as my chemical fitration. I replace this carbon with fresh unused carbon every other monday.
My setup is very simple, though with regular maintenance it isn't that hard to keep things right. I really feel the best component in a fowlr is the skimmer. I myself will be purchasing an overflow for my tank and will be getting an oversized deltec to keep in the sump along with some macro algae for nitrate reduction. I feel that my tank is pretty well stocked right now. I have 10 fish and at least 4 of them are gonna get some good size and will eventually need a bigger tank. That wont be for like another year at least, but they are big eaters and do eat alot so I feel I need a bigger and better skimmer. Point being, if I would have not held back before, I wouldn't have to worry about it now.
anyway, good flow around your rocks, a tank big enough ofr what you wanna keep (at least til you upgrade), regular water changes, some decent lighting you can live with (though the better the lighting, the nicer your fish look) and of course the skimmer, along with a good husbandry ethic, you can have a very satisfying fowlr.
I love the fish, and in a fowlr, the combinations are endless.
My dream tank is a 600 gallon display tank and only housing fish from the waters of Hawaii. Soon enough my friends, soon enough.