Thanks a lot for the advice.
I have friends that have kept a single angelfish in community tanks and not had any issues, and also the advice from my lfs
is that by having several angelfish there is more likely to be issues as they pair off, or when males are competing for females. I was told that you will not have these issues with just one, although it would establish itīs territory, which should be fine in a 40 gallon tank.
It seems that there is no correct answer when it come to some topics, as people have had different experiences, and each fish is different.
I want something like an angel because I would like 1 slightly larger fish in the tank