I need help... new to tropical fish since spetember last year. Bought my first betta in January and it suddenly looked terrible a few weeks ago so treated water with fin rot treatment but sadly lost the betta. Finished the treatment and after a week water tests were fine so bought a new betta. Within one weke this fish was sick too. Was sold another treatment, levamis. Betta then looked like a worm was coming out (?) and seemed better for a day. Now he is looking awful again at the bottom of the tank. All other fish and shrimp seem fine. We did lose a couple of tetra over a few months slowly getting very skinny. I don't want to keep getting these fish for them to die :-( x