One of my local pet stores is having a sale on bettas, so I went to check it out. I was appalled to find that almost all of them had bad fin rot. I asked for a manager and asked what was going on here. He told me that they had ordered a shipment of 6 betta fish last week. When he arrived in the morning 2 days ago, he found a box delivered last night and left out in the cold. It was from his fish supplier and contained 67 bettas, all suffering from fin rot. they are treating them all with meds and daily water changes. I just cant believe that a supplier would unload sick fish like that.