O.K. Just got back into fish. Got some guppies from a friend. When I got back home female that he just gave me had fry in bag. Put fry into 1 gallon tank with fresh water that I had out. Put live grass in tank. Fry doing good for 2 days added sub-heater feeding fry same food as I feed all others ,grind flake food into powder.saw fry eating no problem. Had air hose in tank no filter.woke up next morning day3 fry dying.what did I do wrong so I will not do it again .Thanks