callum I hope you don't mind I moved your thread to a more appropriate board this way it will get more responses

As for the angels I would suggest at least a 55g or bigger for four angels. they can be really aggressive especially at spawning time. I'm down to two males in the 75g and they still come from each side of the tank to peck and run once in awhile.
Just about anything that is too big to go in their mouths will be good tank mates. I have black and green neons.
Carol