Ive been away for a few days and came back to this pics to follow. It looks like fin rot but not sure so Id like some help. I dont know where it came from. I religously change my water 30% a week never had a problem. My stats are Nitrite0 ammonia 0 nitrate 15 the only thing that has change is I switched to softer water but my polys in my 40 gal are fine.










