protein film

Hi everyone, Can anyone tell me what's wrong with my betta? I don't know if it's fin rot or something else. I currently have: - 3 gallon tank with a divider (will be upgrading to a 10 gallon when I move this week) - a controlled heater - a filter - caves for each betta - a silk plant -...

Hi all, I was on vacation for a week (my fish was being taken care of at a friends house in his 1 gal tank while I was away) and now that I've gotten back, I noticed that there is now what looks like a protein film in his 5 gal tank at home (again, no fish in there) but it isn't on the surface...