FishSticks,let me see if I can help you out,buddy.I do have a 55 gal tank from Wal-Mart,and yes I do have angelfish,,it gets even better,two of them are veils.
So,now we know that you can definately keep a few angels in a 55 gallon.(Remember that amount of gallons decrease with every plant,driftwood,gravel,and any ornament you decide to add)
So far so goo,let's continue...........
1---------------Yes you can keep angels,even the veil varieties
2---------------Veils don't get to grow as big as some of the other less fancy varieties.So,stop worrying about the fins sticking out.
If you decide to mix veils and regular size fin angels,be aware that in case of fightings,veils usually loose the battle.To avoid this,get the veils first,then the others.If possible,the veils should be slightly bigger so,the others won't try to bite their long fins.
3---------------tank mates.Well,I see you would be mixing asian and amazon fish.It could work.About angels attacking the rest,well,they are chiclids after all.Territorial fish by nature,and let us NOT talk about pairing up and breeding.I would not refer to them as being "
angelic".
Now moving on to your gouramis.....It would be OK for a while,until your angels start to grow and feel more territorial.I wouldn't even mention breeding time uffff

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I leave you with some old pictures of my 55 gallon tank and some of its inhabitants