Oh ps if your gonna start a brand new salt water tank invest in some coral or live rock that has been established in a salt water tank. It will dramatically shorten your cycle time. But I would only recomend a salt water tank if you have deep pockets, even small set ups under 100g can easily cost thousands just from corals.
Take this reply as a general answer. I might miss some things but here it goes
salinity meter
salt
a large container to mix salt water
protein skimmer
live rock
filter
sand depending on the fish you get
lighting if your going to get coral
and about 2 months to cycle a tank. Salt water tanks take nearly twice as long compared to fresh water tanks. The beneficial bacteria that consume ammonia and nitrite in a fresh water tank differ from the bacteria in salt water tanks.
I disagree with the whole "no filter" idea. I've been keeping and maintainin reefs for years and all of them have filters. None of them have detectable nitrates. I would consider the protein skimmer less necessary, at least in the beginning. You can still run 0 nitrate without a skimmer, but as your bioload grows it will be more necessary to improve water quality and reduce water changes. I also recommend eventually getting one if you want to do corals though. you will see a difference!
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