A good observation consists of information that isn't something a two-year-old could figure out. It's something that helps you better understand the working of the tank and the fishes inside it. An inference is something that you can guess from looking at the tank.
I can make several observations from just looking at a picture of this tank in my aquatic science classroom. The orange fishes love to group together and the big black fish just swims around on it's own, as well as the silver fish. The back of the tank is dirty and the water is clear. The rocks and the plastic plant are placed together so the fish can hide and play around them. Judging by the size the dark fish is we can infer that the fish are well fed.
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