Other things to consider for your budget...
#1 Tank Size
Welcome to NanoAquatic
Here you will find all the essential information to start your own nano aquarium. Before we move on to the guide section, read below and first consider your ideal tank size, sump or no sump and if you want a full reef setup or fish only. Each section will explain roughly how much certain items will cost so keep in mind what your budget is.
#2 Sump or no sump
want more filtration?
DIY method is the most affordable way to keep a sump if you wish to have extra biofiltration. With more water volume, extra beneficial bacteria and small critters to break down wastes, you can add more fish and inverts.
Hang-on back refugiums doesnt add much extra water volume as other methods but it is still great to keep chaetomorpha, rubble rock and copepods as well as hiding your mini skimmer and heater.
You can choose from various different companies that makes sumps, but this route might be costly. You also might not find your right size to fit the bottom of your tank. With that said, if it works, it's hassle free.
#3 Reef or fish only
Reef can be both affordable and extremely expensive at the same time. Depending on the size of your tank and your willingness to spend on equipments as well as high end corals costs vary greatly.
Great thing about the saltwater hobby is that you can significantly lower your cost and still make your tank look nice and simple. This particular tank pictured is sumpless, skimmerless and has an inexpensive light.
Extra biological filtration
You can get burrowing creatures such as gobies, pistol shrimps, etc.
You really do need creatures to sift through your sand.
Unwanted stuff building up making your tank look ugly if not cared for
Do not have to hassle with getting creatures to sift through your sand
Looks clean, easy to siphon wastes
Can increase water flow without sand dunes
Does not provide the extra biological filtration