I ordered some panda corydoras online and a few other things since I was paying a $30 shipping fee I wanted to make it worth it. Anyway, all 6 corys were DOA and everything else was mostly doing just fine. I really wanted the corys so I caved and went to Petco and picked up 6. Everyone is in the 10 gallon qt and I noticed one of the corys had white tips on both pec fins and dorsal. Today they are obvious spots of fungus. Some of the others' fins look a bit worn but nothing requiring more than clean water and observation. I have had Paraguard in the tank from day 1 treating prophylactically doing 20% water change daily. I was thinking I might take this cory out and spot treat with a qtip and meth blue but I'm not sure how corydoras do with meth blue. Is there something else I should do or is this a good plan of attack?