Checked on the tank it’s in, everything fine all inhabitants alive. Check again an hour later after doing a water change on another tank and see tetra surprise for lunch in unidentified shrimps mouth. Can’t say it’s impossible that the neon died in that hour through some other cause, but it seems highly unlikely and I really couldn’t tell you what from to have died so quickly from being in a healthy condition just an hour before. Have a few neons in there whilst rescaping another tank but thinking it wise to move them as this thing has started being aggressive towards them now as well (fin nipping with pincers). Really curious to know what it is as it’s behaviour is so bizarre compared to Amano’s or RCS.