So I'm a beginner in this hobby. I started about 6 days ago. I bought 3 fancy guppies on the second day and on the third day I bought 1 panda Cory and a algae eater. And on the third day one of my fancy guppies died. I was shocked because I didn't know what I did wrong. So on the 3 day I went back and bought one more panda Cory and 2 glo fish. And today one of my glo fish died. Which was kind of dumb because I just barley did the water change. Please help me. I want to become an expert on fish's