Hi All, I'm looking to get your opinions on my beta fish. She's had these white marks on her head since we got her. We've tried a white spot and fungus treatment but it hasn't made a difference. I'm wondering if it's maybe velvet? She seems to spend a lot of time at the bottom of her tank too. It's 40l and kept at 26 degrees celcius. The tank has been set up for about 4 month now and has weekly water changes There are 2 snails and 6 tetras in the tank too. Do you think I should be worried?