I got 9x 2" logfin super red bristlenose from a very reputable local breeder and I put them in a mature 60 gallon tank today around 2 pm I found 2 dead and then around 8pm I found another 3 dead along with 2 of the 3 blue eyed bristlenose I had that were 3" all the mollies and guppies are fine so is the 6" regular bristlenose. I checked the ammonia, nitrate, and nitrite and they were all 0. I'm doing a 60% water change right now. The only thing I can think that it might be is I started feeding cucumber using a butter knife to weigh it down but I had always read that using silverware was safe am I wrong