Who else keeps fish?

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I'm fairly new to keeping fish, tropical to be exact. I heard about "MTS" - Mutliple Tank Syndrome. Before I even put fish in my first tank, I had already bought a second, and now I'm on my thirs, getting bigger every time. What fish do you keep? I only have white cloud mountain minnows at the moment but am looking into buying some dwarf pufferfish for my large tank in the next few weeks.