Recently, I sadly lost one of a pair of freshwater angelfish.  I have read that the remaining angelfish could stop eating with the worst case scenario being its death.  However, I have also heard that the remaining angelfish may not bond with a new angel and could become aggressive and territorial.  I sought professional help and was advised that the decision would always be a gamble as it would be impossible to predict the behaviour of the fish.  Have you found yourself in a similar position?  Did you replace the angelfish?  What were your experiences?