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I've seen guppies housed with smaller size angels, around quarter size but it just all depends on your angels. Some angels tend to be more aggresive towards others then other angels, watch them interact with the fish you want to put them with, of they are always nipping and chasing them around maybe it's a bad idea but if they seem to do fine , I would watch more closely but I'm sure you can let them cohabit until the angels grow.