I have a 25 gal tank with 3 large angel fish (3” bodies), 5 large Rasbora, some guppies, a green algae eater, albino cat, and a black kuli. I put 8 ghost shrimp in my tank and within 2 days all three angel fish, all five Rasbora were dead and all the large guppies. The rest of the fish are doing fine. Two tiny fast sword tail guppies and one neon survived. Water PH and ammonia is fine. I suspect the ghost shrimp did it. I found one of the dead angels stuck in the end of log like it was trying to get away from something. Pretty horrible. I don’t know if I should do a complete tank break down and start over or just keep going and see what happens next.