What kind of corals are you looking to have? Could be a good lighting choice, but might not be able to keep some sps
You need 1-1.5 lbs of LR
Just get sand, live sand is a rip off. Your sand and rock become live through your cycle. Nice choice on depth though imo
. I just laid my sandbed down in my 55 gal
. I went to home depot and got some lighting eggcrate, cut it to the size of my tank and laid it on the bottom. If you get anything that digs in the sand this will prevent the displacement of sand from shifting your rocks, causing them to fall and a long list of bad things.
Start with the master test kit. API's tests are pretty much the standard. Test strips are garbage, only go liquid. Later on you can get your phosphate, calcium, alkalinity, magnesium...whatever else you need. No reason to spend the money now when you will need ~a month to cycle and you'll only be testing ammonia, nitrite, and nitrate during that time.
You shouldn't need to add calcium. I use reef crystals, any salt mix with calcium will do you good. People that add calcium are ones that have a large amount of coral in their tank that strips large amounts out at one time. I have 10 corals in my 36 gal
and have no need to add calcium.
You tech do not need a filter. I like having one on my tank to help keep my water pristine and it adds some extra surface agitation. Can't go wrong with extra water movement.
You won't need to do a sump right away. Just start with the basics, take it slow, and if you need help we'll give what we can.