Hi, I see your betta is a crown tail, most people prefer crown tails and they are more expensive usually. I prefer veil tail because I like neatness and all those fins everywhere bother me, I like them to all be together and neat(ish). I have had fish for a long time so let me give you some tips
- Filter: you should get one. It aerates the water (adds oxygen), as well as cleans the water which keeps you fish in good health. They can be had for a fairly low price ($10-$15), however if you want a better quality one they will run you about $30. I use an aquaclear 30 on my Betta tank but that's because I have other fish in there and it's a 10 gallon tank. An aquaclear 20 would do you well, they are very quiet and easy maintenance.
- Heater: betta's do best in 75-80 degrees so if room temp is above 75 then great but I suspect it isn't. A betta will survive below 75 just fine but if you want him to thrive then it is recommended. Also if the temperature in your house drops for some random reason then he will be safe. They aren't very expensive. You should get a 25W one, they will run you about $15 on average. It will take some adjusting to get it to the temperature you want with lower quality ones but they will do. You should also get a thermometer, this is what I use (as well as most of my local fish stores) and it works great.
- Plants: Although this isn't essential, betta's like some plant's to hide in.
- Food: I don't know what your feeding him but Betta's are carnivores, and as such feeding him tropical flakes (omnivore food), is like feeding a Lion grass. I feed mine these, they are the best you can buy and my Betta loves them. Pellet's are better than flakes for betta's, I don't remember why. Something about their mouth placement causes them to swallow air with flakes but is not the case with pellets, swallowing air can cause their stomach to get damaged or something like that. I'm not sure, you will have to look it up.
- Maintenance: For optimum health you should change 10% of the water once a week. But a 20-25% water change once a month should be fine. Also replace the filter pad's (only foam part, not biological filtration part), once a month or whenever they get particularly dirty. They only cost a few dollars at most but if you want, you can just wash them off and re-use them a few times.
- Friends: Yes betta's can have friends but only if you know what your doing. Betta's are territorial so if another fish comes into his territory (the entire tank if he's the only one in there), then he will establish his dominance which may kill them. The best way to do it is to add the other fish to the tank first and then the betta. Since you already have him, an option would be to take him out and change around the tank decorations then put in the new fish, then the betta. He will think its a new tank and will be less likely to attack them. You have to choose the right fish though, refer to this site. I personally have cherry barbs and african dwarf frogs with mine. However I successfully had neon tetra's and ghost shrimp with him in the past. I also have an oto, which is a fish you should definitely get. An oto is a small suckerfish and he cleans the tank. You don't need to feed him once you have algae in the tank (exposing the tank to sunlight will help), until then you can get him algae wafers. He cleans the tank and there is a 98% chance that the betta will leave him alone after the first few minutes you put him in, even if you didn't do what I said you should earlier.
I think I covered everything, sorry it's so long. As for adding the betta to the tank (or any other fish). You should float him in a bag for 15 minutes minimum to get used to the temperature and then add a bit of tank water to his bag every once in awhile to get him used to the water chemistry, after that you can let him out. This is not required, and he would probably be fine if you just dumped him in there but it is the less stressful method and more stess = more likely to get a disease and die.
I have a 10 gallon tank, and a 55 gallon tank (I had a 65 and 90 gallon tank 3 years ago but it was just too much). I keep the temperature at 77 because 7 is my lucky number.
Pictures:
An amazing picture I got of my Betta
10 Gallon Tank
You can see one of the frogs in this picture (bottom left)
55 Gallon Tank
Inside the Cave
Yes, I know the outside of the 10 gallon tank is dirty. The fish told me they don't mind. The water level is low so the frogs don't escape.
If you have a phone with a slow motion camera (such as Iphone 6+), try videotaping him with it, it looks really cool! I personally have a galaxy note 4 and it's a very fun thing to do.
If you read everything then here is a cookie
, enjoy!