I have had one angel fish with my 5 discus for a few months but the past week or two I've noticed a severe increase in the Angels aggression towards one of my discus. I came in the room the other day and the angel actually had the discus pinned in the corner of the tank and kept nipping the side of the discus. Any reason for the dramatic aggressive behavior all of a sudden? And is there anything I can do to eliminate this, short of moving the angel fish out of the tank?
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As Ricardo mentioned, the angels may be reaching maturity and since he does not have any mates of his own kind, he will seek out the weakest of your discus as his challenge. I've never kept just one angel in a tank with others, unless I know the specific angel temperament. I've kept angels with discus for many years and they never mingled with each other. Then again I always kept 4 or 5 angels in each tank with about as many discus. If your tank is big enough you might be able to add more angels, that is if you want to try and keep them together, if not you can take out angel and start just an angel tank and enjoy both species..
Jorge Q