1 of my angelfish recently died. I have had him about 3 weeks and he seemed to be in good condition when I purchased him. When dead, he showed no signs of disease etc(fins were fine, no white spots). Another angel fish, slightly older is nowhere to be found. I removed the Hornwort in my tank and moved around the driftwood but could still not find him. I am assuming he is also dead. None of the other fish are showing signs of stress or disease. Ammonia and Nitrite are at zero. Narrate is at about 20(my tap water is high to begin with).