Hey. Sorry if this comes off as rude, but you need a bigger tank. Nothing massive, but generally it is recommended to get a 2.5 gallon tank or more. The smallest I have is a 5.5 gallon. :)
Also, betta fish are Tropical fish, so they need a water temp. of 76-82*F. It is best to get an adjustable heater to help. I'll provide links at the bottom.
Bettas can go without filters, but you would need to do water changes more often. Most people here use Sponge Filters for smaller tanks, and Hang-On-The-Back (HOB) filters for larger. Sponge Filters are powered by Air Pumps, that are usually $10-20. THe filter itself is $5, the heater is around $20. If you can get a tank at the $1 per gallon sale at PetCo, the tank is $10 for a 10G or $20+ for bigger tanks.
A "Betta Buddy" is a type of plant usually a Marimo Moss Ball or Anubias Nana that doesn't need much light. MMB are a specialized type of algae that doesn't do much, but if you can find an Anubias, it will keep the tank parameters down.
So, what I'd recommend getting (*=optional)
- 2.5G Tank or larger
- Adjustable Heater
- Seachem Prime (dechlorinator)
- Omega One or New Life Spectrum (pelleted food)
- Gravel or Sand*
- Silk Plants or Live Plants (No Plastic Plants! They will rip your boy's fins.)
- If you can afford one, an API Master Test Kit to help with the cycling. If not, API Test Strips.
- Gravel Vac
That's all I can think of now, here's the links.
(Get whatever size is the wattage for the tank)
(Make sure to get the Airline Tubing add-on!)
Get the sizes that the tank needs, ex.) 50W heater for a 5 gallon tank, 10G air pump for a 10G tank... and shop around for lower prices! :D
Good luck with your boy. :)