Torn Fins on Fish plz hurry!!

I've heard good things about melafix helping with damaged fins. you might want to get some and att it to the tank. You could also quarantine him and add it to the Q tank. hth

Melafix works great. I use it whenever my fish have torn fins or injuries.

Don't panic!
If it's just a minor tear, keep your tank very clean (it never hurts to do extra water changes if your fish has an injury) and if you have any aquarium salt you could add some to the water, it helps to prevent bacteria/fungus infecting the wound. MelaFix is a natural antibacterial, some say it helps, some say it doesn't do anything. Personally, I've used it and think it's great stuff (and I love the way it smells!)
Watch the fish closely for the next few days. If you do see any fungus or it looks like a bacterial infection has set in, you might have to move the fish to a hospital tank and administer antifungal/antibacterial meds (I recommend Kanacyn, it handles both).
Good luck.

Minor or major?

A minor tear would be like separating the fins on a bird feather, it can knit back together really fast in clean water.

I've even seen bacterial infections where a 1/4" was lost all across the edge of a fin regrow very rapidly in very clean water.

Melafix might help, but massive water changes will definately help.