Lol, aka it's a lot to take care of coral? Same with reef as well?
LOL... The hobby is as expensive as you make it. Most reef keepers go for the high light critters, that means you need the best lighting available. Good lights will run you some money. Next extra expense is going to be test kits (a few extra tests that you must have to keep coral). You also need to be more vigilant on water changes, which means more salt mix and RO water required.
Example:
Basic fish only tests = PH...Alkalinity... Nitrate...Ammonia...Nitrite
Reef test kit = PH...Alkalinity or KH... Phosphate...Nitrate...Nitrite...Ammonia... Calcium...Magnesium
You can purchase frags for much less, they are little pieces of a larger colony of coral, frags take time to grow, you pay for larger colonies...the bigger the coral, the higher the price.
All that being said, there are corals for every type of lighting, from non-photosynthetic, to the glorious SPS corals.
Example:
Mushroom and Kenya corals are pretty happy under T5HO lighting.
Chili, and sun coral don't like light
SPS corals need the highest.
As I said before, what you add to your tank dictates what can be added later, not all critters are reef safe. That just means you have to be careful about fish, starfish, snail or crab selection, and make sure they don't eat coral.
Now about that quarantine tank... I kept a 10g QT on my dresser. They don't need a lot of space, you don't have to have it on a stand, it's nothing fancy...but let me tell you, it's one of best investments you will make in this hobby, and not something you should do without.
Consider this... If you get the parasite ich, the only sure way to be rid of it, is to let the tank sit fishless for 6 to 8 weeks. So where will you put your entire fish stock from your display during that time? It would be much, much easier to just quarantine one little fishy at a time in a small tank, and avoid the problem altogether. Please believe me, the junk they sell like Kick Ich, which is supposed to be "reef safe" does not work. If you have inverts, certain "cures" are not safe for them either.