Then your one in a million, cuz i cant ever keep guppies and danios togehter. I have issues( only small ones) with keeping 2 danio's and 1 female guppy in a 30g( plus other fish)!!!!!!!! At first introduction, the danio's ate her fins off. I've had danio's eat endler sna dfeeder guppies before. Either your lying( not likley), or your telling the truuth, or you Endlers reproduced so fast that you couldnt tell that one had gone missing.