I'm planning on turning my Freshwater tank into a saltwater tank and from my research here is the equipment I'm getting. (my tank is 55 gals)
Marineland emperor 400 hang on back filter
2 1400 gph
A lighting system with at least 4 t-5's and 4 led
Hang on back refugium (because I want a gold headed sleeper goby)
Saltwater master test kit by API
Refractometer to test water salinity
300 W heater
Aragonite sand. Enough for a sand bed 2-3 inches because I want a gold headed sleeper goby.
20lbs live rock
40lbs base rock
You can decide to use a sump instead of a HOB
filter and refugium. It gives you extra water volume and space to put some extra live rock. You can also put your protein skimmer in the sump. Some say its the best way to go. I just don't understand the plumbing and how it works. I will probably upgrade at some point.
Since you don't want corals you don't need as much lighting as I plan on having. My stocking list that I can remember without getting my notebook is:
1- gold headed sleeper goby
1 royal gramma
1-2 false percula clowns
5 orange lined cardinals
Hermit crabs and snails
Lots of corals
I've done alot of research and am starting to make purchases towards my goal. There are so many people on here with alot more experience than me. This is just what I am planning on doing and I think it will work. I hope I've at least given you some things to start researching about. Best of luck to you with your saltwater adventure!