My friend has a jardini aro that he is going to give me. It has some kind of a growth by the back fin and despite my friend buying all kinds of meds online, it's still there. I had one years ago but sold it. I'm worried about transporting it. I bought Koi Calm years ago when I had my fish and wanted to know if it has an expiration date? The aro is really aggressive so I worry. Anybody have any thoughts?