Added them on Sunday, but I just floated the bag. I did not drip acclimate. I'm guessing that is the problem? I woke up today and one was dead and the other was near the top breathing heavily. On Sunday, I noticed that one had a fun that was nipped a little. I was not sure if that was from my fish or not though. I have a 55 gallon with an upside down catfish, lace catfish, two ropefish, and a bristlenose. 0 nitrites and ammonia. 5 nitrates. 80 degrees in the tank. About 8.1-8.2 PH (kinda hard to read). The angelfish don't seem to have any signs of sickness on them (I'm looking at them as they're dead). Any input of why they died would be appreciated.