I've owned bettas in the past and have never had the situations I am facing now.
1. The tail of my half moon fish is all jacked up. (My mom said its because of the coral? but I've had the coral in my previous betta's tank and he lived for almost five years with a beautiful tail) The reason I bought him in particular was because of his gorgeous tail.
2. A wierd fogging/clear film has surfaced on the top of the tank. I can clean the water (completely) and in the next day or two its back. What is it?
I would really appreciate some guidance...