so i came home today after being away from Oscar for a couple days (my mom took care of him) and found his back fin had split from over flaring. i had given my mom the idea to print out a background so i didnt have to keep a post-it note over the filter so he would stop flaring. she didnt check on him for a while and found him freaking out and flaring out all over the background so she took it off but didnt notice his fins until i pointed it out.
hes acting like his normal self and doesnt seemed phased at all by what happened
he is in a 5 gallon filtered and heated tank and i took out the fake plants that could have possibly snagged on his open fins.
he has two splits on his back fin:
i know its kinda hard to see but sadly the only camera i have is my phone camera
will he heal all the way?
how much should i change the water now that his fin is split?
should i add aquarium salt?
any other advice is very welcomed