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I think tetras are great fun. I bought one for my granddaughter last spring but sadly it died a few days later. PetSmart was great! They exchanged it without any problem. The replacement has thrived. Now I'm not sure one can say a fish has personality but darn if this one hasn't seemed to have developed one. He started as a kind of pale, shy little thing but has grown more colorful and out going everyday. Now he always comes to see us when we walk by or feed him. He will in fact jump out of the water a little in an effort to get his food. You don't need and aquarium and the food is inexpensive. Two big pluses for owning a fish.