Betta tail biter or fin rot?

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ADFlove91406

Aquarium Advice Regular
Joined
Oct 11, 2017
Messages
61
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Sorry the Picture is so blurry someone please help do you have it a little while ago and I can get it with melifix and it was going away until yesterday my dad The light in the room that my tank was in and if The light in the room my tank is in gets turned off and my tank light is on my betta fish can see his reflection my dad was there and watched him flare for about a minute and then turned the light back on when I got home you have a little rip in his tail and the next morning he had it again he also had a little bloody spot on his tail too I treated him with the medicine again and he seems slightly better does anyone know what this is and what this is and how it could've been caused?
 
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