After watching an Oto for two weeks at Petco, I got him home and that's where the diseases started breaking out after he died three weeks after I got him home. Can anyone tell me if I'm treating it right? Betta started having this white bump in his mouth on his lower lip. And his lower lip is swollen, he cannot close his mouth, always open. Yesterday there was a white tiny parasite looking worm on Betta's head and sometimes go into his gills. I managed to get the worm off with a hydrogen peroxide q-tips since I have no tweezers and everything was closed. I quarantined him in a 1g bowl with a little live plants and a silk plant. Added 1/8 tsp salt, and he looked a little better the next day. Or maybe I'm just imagining things. I bought Melafix and added a few drops and hope it helps Betta. The main tank only has a ghost shrimp and an oto. They both looked unaffected, so I only did a 50% water change and added 1/4 tsp of salt. Here's a pic of Betta's mouth.