I have been looking at this betta forum and i have decided I really like bettas a lot. How do I tell the difference between male and female? I have gathered from the posts I have been reading unless I can get 4 or more then only get 1. Is this the case with males and females? what is the minimum tank size for 1 male or female? If I was going to get 4 what is the minimum tank needed for that? What food do they eat? Any other info would be great. Thanks!
Hi! It's great that you love bettas, we love bettas too!!
This isn't the whole story, but it's the easiest way to introduce you.
Male bettas are the ones with long flowing fins that you will most often see in the pet stores. Females have shorter, stubbier fins, are often smaller than male bettas, but sometimes fatter, while males have the streamlined look. Females are not often sold as pets. This doesn't mean they're rare by any means! It's just that the males are more profitable, so they sell those.
Only females can be kept together in groups of 4 or more in a 10 G or larger tank. Males can NEVER be kept together. NEVER. Anyone who tells you different is a nut job

Two males kept in the same tank will start tearing each other up very quickly. They are very aggressive.
You should also not keep males and females together. Some people do, but you have to know quite a bit before you try to do crazy things like that.
The minimum tank size for 1 betta, male or female, is 1 gallon (4 litres), though many people strongly prefer to keep them in at least 2.5 gallons. The minimum tank size for a sorority of females is 10 gallons. That will hold 4-6 females. This allows them all to have their own territory, and establish a pecking order, which is vital for females to live in harmony together.
The easiest food to feed them is pellets made especially for bettas. 90% of pet stores that sell bettas will also sell this special betta food. Bettas can also eat bloodworms, mosquito larvae, brine shrimp, beef heart, and a buncha other things, but for a first time I reccomend the betta pellets.