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You would be better to get a larger Angelfish if you want to have it by itself. Small Angelfish do better in schools or with "mates" whereas a larger fish has already gone through that stage. I would take nothing smaller than a med/lg size ( sometimes called "pre-breeder") or larger depending on the size of your tank.
My tank is quited large 80 gallon 100 cm length and 70 cm height and 44 cm width... i have right now 5 platys 2 gouramis 1yellow and 1 blue and 1 big angelfish and 5 mollies and 4 guppies i heard that angelfish eat guppies but i don't think my angel can fit any guppie in her mouth they are medium sized
that's my tank i did some changes in it...with decoration...
They will eat Guppies if they can fit in their mouths. Right now I have a tank divided with a single large angel on one side and about 12 Guppies on the other. I added a little too much water after a water change and a smaller guppy jumped across the divider. She didn't make it. I found her in the Angel's mouth. So it CAN happen.
I wouldn't be concerned if your Angel is not harassing anyone and is eating fine, then alone is not an issue for it.