I've never had to deal with fish illness before so this is a first. My betta Little Devil has some fin issues. Here's a picture:
The water parameters:
pH: around 7
I have just done another PWC. Yesterday I did a 10-25% water change, the fin got worse and I did a 90% water change today. Ahhhhh!!!! What's up? All that's in there with him are 7 chili rasboras. It's an 8g tank. The temperature is usually 78-80F but I upped it a little so now it's 83F-ish.
I don't know if it's tail biting, fin rot or something else. There seems to be no red or brown stuff on the edges. Please help Little Devil!!!