Mirror Modifier + Fish Fins

Okay, so I gave up on trying to use the x-axis mirror to get to where I wanted and used the mirror modifier. However, the fins that I had made along the center edges are now doubled because of the modifier. Can someone tell me how to make it so I only have one fin along the edges?
I attached a screen cap of the problem in case it’s hard to figure out what the heck I’m trying to say.

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You can increase the merge limit on the mirror modifier. Please note though that having no thickness on the fins can cause problems with the normals.

Thanks for the tip :slight_smile:
I’ll take care of that ASAP!