Went to check on my angelfish that I was worried about and I see all my barbs are pale and one is dead. They looked so healthy this morning I can’t believe it. Today I did a small water change using prime and got some new angels from a breeder and everyone seems fine. I dont know what could have done it. Could I have used too much or too little prime. No ammonia or nitrites- less than 10 ppm nitrates. The gills of one actually look a little reddish but I feel like I usually use double the amount of prime so I don’t know how it could be from chlorine..