I woke up this morning and went over to my tank and turned the lights on to give my baby his breakfast, and what do I find? I HUGE section of his tail is missing!!!!
I know that it isn't fin rot. There's aquarium salt AND betta fix in his tank.
I have come to conclude this is the culprit.
So today after school I will remove the undergravel filter and give him a salt bath. *FRUSTRATION*