hi everyone. as im sure you know ive had troubles with my sterbai cory who has a mucous (not sure on spelling) type infection. She has had it for a long time, but it wont clear up. She feeds normally but she isnt as active as the others. There is a pale layer of mucous on her flanks behind the pectoral fin. It never spread until i just noticed my female panda has a tiny bit on her now. I want to gt this sorted before i get the plecs because i dont want it to cause them harm. Ive treated with medicines before, whats the best to use? thankyou