I my experience, once you step in, you will upgrade & upgrade.
Time after time, you got a lot of cheap equipment in your house.
So, I hope you save more money to get something better.
At least you feel good but not cheap that make you feel uncomfort
This time you change 15' to 24', next time you step up to 48"
I suggest you buy equipment that can be use later.
Such as
1) Black Sand: $80 (very easy to setup and reasonable price) Gain experience from that and not make you down to quit
2) Filter: JBL 600L/H, $600 (easy to handle for cleaning & change inside material, further, future can be use if you change a bigger tank)
3) CO2 system: 雙錶頭電池閥+1kg 氣樽, $800 (initial price is big but easy to maintain. Recharge is cheap [30HKD], also, it can use almost 3 months, depends on your grass density. Also, future can be use! My 40' tank are using

)
4) 暖管: Sera / Tetra 100W, $150 (Electrical device, buy someone reliable, my Tetra 200W use 5 years already.)
Others I have no comment
