Dear All, I am a newbie in this domain, I built a 3feet tank and put the fish on last thursday 5th April 2018. Its a mix of Edler Guppies, Albino Guppies & Neon Tetra. This morning one of the Female Guppies died, and I felt devastated...Sorry I am very emotional when it comes to a pet dying..had put in lot of effort to make sure it doesnt happen, but it did happen. below are few points that I think might have caused it. Could someone please help me here, I dont want more to die: 1 - I was advised by the Aquarium shop guy to have a week old water which contains bacteria and then put the fish in it. I did not do that due to the huge size of the tank & used only ONE day old water. 2 - Overfeeding - last night I felt they were too hungry and excited to see the food, so dropped almost 5 pinches of food (fish is around 90 in number) 3 - Male to Female Ratio - I see more male guppies than female guppies in the tank, not sure about the exact number as counting is tough SOrry for the long post, your help is appreciated.