I honestly think that in the long run, it is more cost, time, and energy efficient to save up some money, do your research, read reviews, and buy quality equipment (filters, heaters, light) new. I would recommend looking for a used tank and stand on craigslist though, may find a decent tank for a good price! With heaters and filters and lights, you risk them dying or failing on you, them being damaged, or just the fact that they are used can mean they won't last as long. It is definitely risky. Buying them new means you can make sure you are getting exactly what you want