Ok lately my fish have been dying. I've lost one
neon tetra and one platy this week. In the past two to three months I've lost a dwarf gourami, two blue rams, a cory cat, and another platy. I've tested the water several times and the water seems to be normal. I have no idea what has been killing them. Could it be something in the water? Well the weird thing is, is that I found a baby Platy swimming in the tank. I never knew the platys even spawned!!! I have no idea where the rest of the platys are. I guess he is the only one that survived. How can I keep from this baby platy from dying

What do i feed him? How can i keep my fish from dying!! HElp!!