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Another victim! First of all a 6.5 gal will be heaven to your betta. Or you could even put a divider in and have two bettas!
As far as plants are concerned, you can go with either live or fake, but if you use fake, no plastic. It will shred their fins, use only silk plants. If you go with live plants you will need to make sure you have the proper lighting, substrate, etc. I'm not an expert on the live plants, but I know they are a lot more work, but probably worth it in the long run if you want to invest the time. Either way, bettas like to rest on plants, I keep at least one tall one in each tank because they are lazy and will lay on the top of the plant and just raise their little heads for a gulp of air.
Yes, you should have a heater. A 50wattt for a 6.5 gal tank. SRC has a thread here that shows several different types. A heater will keep your temperature steady and is less stressful than constant fluctuations. (I am dealing with temp problems right now.) If you haven't thought about it, be sure to get a thermometer too so you can keep an eye on your temp.
Gravel or sand is a personal choice. However, if you use an UGF in your tank you cannot use sand. I have gravel, but am considering going to sand when I change filters in my tanks. Sand looks more natural and the fish seem to like it better.
Your choice again on a filter. I personally would use one in a tank that size. If you don't mind a lot of water changes, you can get by without one. If you do use a filter, be sure to get one that does not cause a lot of current in the tank. Most betta's hate strong currents and will hide and stay at the bottom of the tank.
Yes, you can use media from a cycled tank to cycle a new tank, but you will get better info reading the pinned articles on cycling than I can give you.
Hope this answers some of your questions. Let us know when you bring your little guy home!!!
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