i guess you want a reef tank. my honest advice dont buy either of those. slowly upgrade your tank over time when you can afford it.
start out with.
i would by a used 20 or 30 gallon tank. or bigger if you can afford it.
i would use a regular hob filter and a regular light.
buy a small piece of liverock, like 5 or 10 dollars worth.
buy sand if you want it
figure out how you gonna get saltwater, maybe a lfs
if you make your own with mix. buy a bucket that treats over a hundred gallons.
then find a source of water you want to use. maybe RO or distilled from a grocery store. you can use dechlorinated tap if you dont have inverts. I wouldnt buy a RO filter yet as you just want to get your feet wet in saltwater, they are costly.
test kits for nitrogen cycle.
this will be the beginning tank. you can have a couple small fish no corals, inverts if you use RO.
over time when you can afford it buy these items.
-first, this is really really recommended but you can do a tank with out it, get a protein skimmer rated for your tank size. it is very important to buy a good one and read reviews. expect to spend atleast 200 dollars, less if you buy used. now you can add alot more fish and still keep your water quality good. will also reduce the amount of water changes.
- buy base rock, this will eventually become alive from the original chunk of live rock you have. expect 2-4 dollars a lb depending on the source, you want probably atleast 1 pound per gallon.
- next buy lighting for corals, depending on what corals you want to keep and how big the tank is this will be from 100-500 dollars maybe more. i would say expect 200-300 for quality lights you can keep many corals with.
-test kits, for ph, calc, magnesium. and supplements for calc and magnesium.
now you have a quality full reef tank. there are other pieces of equipment you can add if you get really serious.