So I've been thinking about getting a betta for a while now and I've been doing a lot of research. I don't have a lot of money so I was able to get a used 10 gallon from my aunt. It hadn't been used for years and it was pretty dirty. Cleaning the actual tank itself wasn't too hard, I just used some warm water and vinegar. However I'm not sure what to do about the gravel and decorations that my aunt had in her pile of old fish stuff that she gave me with the tank. I tried rinsing the gravel with warm water but I'm not sure if it's really doing the trick. So I guess my question, should I just rinse the gravel a couple more times and then use it for the meantime (and buy new gravel when I can afford it) or should I trash the gravel right now?
(also if I were to have some live plants in my tank would I need a different type of substrate or...?)