Fin rip?

[Orchidbetta]

This is Zeus my 3rd betta. I’ve had him since about 2 months. I cycled the tank 5.5 gallons using media from my other tank. The water parameters are where they should be and I do PWC once a week. I have live plants and the heater is at 80. I also had driftwood in there but removed it yesterday. Zeus is a good eater, bug bites, hikari pellets and fresh shrimp brine twice a week. It all started with a tiny pinhole in his fin. It became bigger till it ripped and more rips are happening. I put some Stress coat yesterday and I also bought Kanaplex but did not use yet.
Any advice would be highly appreciated. Thanks

 

[Dallascowboys16]

This is Zeus my 3rd betta. I’ve had him since about 2 months. I cycled the tank 5.5 gallons using media from my other tank. The water parameters are where they should be and I do PWC once a week. I have live plants and the heater is at 80. I also had driftwood in there but removed it yesterday. Zeus is a good eater, bug bites, hikari pellets and fresh shrimp brine twice a week. It all started with a tiny pinhole in his fin. It became bigger till it ripped and more rips are happening. I put some Stress coat yesterday and I also bought Kanaplex but did not use yet.
Any advice would be highly appreciated. Thanks

Anything with sharp edges in the tank? That definitely does not really look like fin rot. It looks more like he might be tearing them on an abrasive surface.