So I recently got a ten gallon tank for my betta about 3 months ago, and my betta seems really happy. My tank doesn't have a heater or a filter, and currently there is one plant, but I will be buying much more plants to put in. (I would also like some recommendations for plants) But now that winter is coming, I am starting to look for a heater. So I just want to know what is the best heater for a ten gallon tank? And is a heater safe for plants? I prefer to buy it in a store if possible, but I guess online works as well.