Hi Wilson
Sad to hear about your barlett... similar to what happened to us... we bought 5, 1 wasnt very healthy (got a scratch i think) and died.. then later another also gone...
Also, perhaps you have bought the wrong sex.. they say if keep multiple, must get 1 male and rest female.. otherwise the males will fight until left 1..
Anyway, thats life... sometimes is like that.. take it easy..