My Fred has curly fins...not infected, not damaged...just curly on the ends. He's a veiltail, with some very long finnage. I originally thought it was some sort of damage, but I equate it to hair. You know how some people get little curls on the ends of their hair when it gets long (my kids have this)? It's kinda like that. Fins are long, flat objects, and can curl like ribbons at times.
1 - 55 gallon planted community
3 - 10 to 20 gallon planted betta tanks
My advice: slow down, think, and be willing to learn. Then you'll be fine, no matter what.