Hello Li Jin,
First off, welcome to the forums.
If you want something small and hardy and active, try Rosy Loaches. I have 12 of them in my 4ft tank and they are constantly poking their noses into everything. They do not behave like dogs, which are more reactive to human contact. However, some fishes will "learn" to recognise your presence as a sign of feeding time. My angelfishes and other fish react when I come close to my tank, even if I am just walking past it.
A simple "planted" tank of sorts would be to use plants like submersed forms of Java fern or Anubias, grown tied to pieces of driftwood. That way you can move things around and keep it simple so you can enjoy your tank with minimal fuss.
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