Ok we bought the tank filled it with water, hooked up the pump the heater and the light. Waited 24 hours put the rocks (after we rinsed them) and the decorations waited about 4 hours put the water treatment. Then waited another hour. Then we added a neon tetra two hy115 (apparently new species) tetra and a guppy. We acclimated them for 30 min just like the book said and then after they were in the tank for about an hour we fed them. Just three little flakes they didn't eat. The neon after about 3 hours of acting normal started floating upside down and then swam to the bottom and died now the guppy is doing the same. What did we do wrong? Sorry for the life story just wanted you to get all the details