I just completed cycling a 7 gallon bow front nano reef. I replaced the NO lighting with a retro fit PC lighting which gives me 32 watts. It will be enough light for some basic mushrooms, polyps and a small brain. I have added a small power head for circulation and a whispper filter. I have a left over seaclone skimmer so I might add it later, if I need to so far I do not feel the need. I am just going to propagate out of my other tanks. I currently have a clean-up crew and a very small damsel. I added 7 pounds of Marshall island LR and 14 pounds of LS. Part nature's ocean and part fiji.
The trick I have found so far is to remember HOW small it is.......I know that sounds dumb, but the first time I went to feed the fish, I picked up a pinch of flake put it in the tank and it was way too much. I had to remove it. I have to carefully measure the additives, because a little too much in my big tank is no big deal, a little too much in this tank is a hugh problem.
Try a 10 gallon tank, it sounds like you have been keeping a bigger one for a while, and have fun.
Good luck,
Connie