55g planted. 2x 54W T5s. ~3BPS (30ppm CO2). Dose Dry Ferts. So one of my Amanos died today and not sure why. He was one of my smaller ones (about 1-1.5 inches) so perhaps he was bullied. I had 7 total before he died. I introduced 3x Dwarf Gouramis and 8x Black Neon Tetras (total 12 tetras) two days ago and they're all doing great. However, I noticed that when I put them in the tank, the Amanos started to hide. Tonight I came home and found the poor guy dead on the front of my tank . Here's the thing: I had TERRIBLE green water so I got a UV Sterilizer. It worked great! It got rid of the green water in about 48 hours. However, it turned cloudy afterwards, almost as if it was going through another cycle. After my usual 50% water change at the end of the week, the Ammonia reading was .5 which makes me wonder what it was at before that... I did another 25% later on and it got back down to safe levels. I got back from work today after finding that Amano dead and did another reading and found Nitrites 0, Nitrates 5 and Ammonia .5 again. I did an emergency 25% change and will do another reading after. However, after finding that one dead guy I found another floating around. The poor guy was still alive and his little flippers were kicking. I moved him to my QT but it doesn't look good for him. My 3 Dwarf Gouramis and 12 Black Neon Tetras are doing perfectly fine (Gouramis weren't too happy about my flashlight looking around for any more dead Amanos). So here's my question: Is that normal for getting rid of GW for Ammonia to spike like that (Tank is crystal clear now) and are Amanos really THAT sensitive to ammonia spike even if it's .5ppm? It seems that Amanos are the only thing that I have difficulty keeping alive. I don't want to just keep restocking my supply; I want to figure out what's wrong.