So chickens like them? Interesting! They are good with mosquitos for sure. The tails of fancy guppies often look like food for many fish. We have had problems with tetras, barbs, which are nippy in the first place, other guppies, etc. bothering our fancies, which is why we are very careful in keeping them away from other fish. I will definitely stop raising mosquito fish with my fancies, definitely not risking my good breeding lines. Do you keep your fish indoors or outdoors?