The best way to go for everything that your gonna need is right here, you can go cheaper but it's be easier for you down the road.
Equipment -
Protein skimmer - preferably double rated for the size of your tank (60 gallon rating)
Sump - add bio balls and possibly a section for a refugium
Strong heater - 50-100 watts
Strong lighting system - if you plan to keep coral or not, if not the just regular light
Saltwater test kits - possibly a reef master test kit as well
Circulation pumps - the sizes depend on if you plan to keep corals
RO/DI unit - if you can afford a 5-stage, if not at least a 4-stage
Then when you get all this, buy some salt, add 30 lbs of live sand, 10-15 lbs live rock and another 10-15 lbs dry rock and your all set.
Some may say not all of this is necessary but when I started my 20 gallon nano, I had only one weak light, a canister filter, a heater, and a circulation pump. I've added all these thing on the list now just because it makes everything easier and healthier so from my experience this is all necessary and very helpful.
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