I just setup my first marine tank a few weeks back and I have already made a few costly mistakes and learned a ton.
Research is the key with a saltwater tank. Research everything and anything including reviews of equip....Coming up with an exact plan of what you want to keep first can make things a bit easier.
A lot of people recommend "The Conscientious Marine Aquarist" by Robert Fenner. I bought mine of Amazon for around $15. Read all the stickies, getting started forums...
Corner tanks are not always the best but it is your choice. 65 gal
. is a great starting size, however I would not go with a corner especially if you are going to have hang-on equip. as well as lighting difficulties.
came with everything you need
Find out exactly what it comes with and ask because it may be just basic stuff or even stuff that you do not need. If you absolutely want to shoot for corals you will need good lighting. VHO
will be good for most soft corals and MH
and clams. I have a 192 watt Coralife 50/50 PC
over my 30 gal
Most will say that 1.5-2 lbs. of LR
per gallon and a good skimmer is all that is needed for good filtration along with some Powerheads for ample water movement. A refractometer, a titanium heater, aragonite substrate over CC, another PH, heater, bucket/barrel for pre-mixing salt....I can't think anymore but others will give you better advice. Good Luck