I moved some fire reds from my pH 7.6 tank to this pH 6.0 tank 48 hrs ago and they seem to be doing well so far. No deaths or signs of stress and all appear to be eating well. Some females are berries, but not sure if it happened before or after the move (thinking before). I saw maybe 4 shrimplet during acclimation, but could only see 2 today. I'm unsure if they died or are just hiding in the somewhere.
Others may have more experience with Neos in a low pH environment