Looks like a pretty butterfly delta-tail (DeT). Those little curlies on his fins are part of his personality, his "look". I think it's charming. He's still young. I think his fins will turn solid orange.
Perseusmom and Sainthogan gave good advice for removing him from his tank. It's a trick you'll learn how to do. When you get a larger tank, you won't have to do that.
He needs at least a 50% and a 100% water change each week. See OldFishLdy's water change thread:
Sometimes Petco has a dollar-a-gallon sale. That's the best time to get a 10g tank. Then you can keep two Betta.
Welcome to the forum, Butterfly.