HI everyone! I'm new to this site and new to having my own fish, thanks to a random Christmas present from my mom lol. She got me a small hydroponic tank and gave me a VeilTale betta with it. Everything was going fine until I bought some Malaysian trumpet snails to help with the waste cleanup. I followed the instructions given on introducing the snails to the tank, which included a week quarantine before being added. But within a day of adding them to my betta tank, my VeilTale began acting strangely. Either floating in one corner of the tank, or laying at the bottom of the tank. I did some Google searching and after coming up with not much, I decided that perhaps I had introduced a bacteria or fungus to the tank with the snails. So I began treating the tank with Pimafix and Melafix because that's what I read was the treatment. After a few days of treatment, my VeilTale seemed to be getting more back to normal again, but then one day I found him, dead on the bottom of the tank. Thinking that perhaps the toilet of being sick for so long had just taken its toll, I went to Petco and picked up a beautiful black betta, I forget the actual type name. I added him to the tank after getting him accustomed to the water, and he swam around quite happily for a while. Later that night I noticed that he kept to the corner of the tank, near the surface, and wasn't much interested in food. I read online that this was likely just a bit of shock due to his new environment. I still would see him occasionally flit to one side or another, so I left it alone. This morning I left for work and he was doing his chilling in the corner thing and thought nothing of it. I come home from work today to see him in the corner again, but an inch or so below the surface, and positioned vertically, both which I thought were odd things. I move in for a closer look, which I have done every day since I got him. And I see he's absolutely covered in this white fuzzy film and completely lifeless! Anybody know what in the world this is? There was not even a spot of this on him this morning and he seemed fine.