What are some practical applications of physics in water and aquarium systems?

[Invadetor]

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I'm not really the best with Physics (in few words I mean that I suck at it), but I do like it, or at least it sounds cool to me!
While I'm a still a student, in our school we don't make Physics, so I want to learn somethings by my own, especially stuff related to Water and Aquarium, because i really like these!
Plus I want to be a programmer and for what I know, Physics can be helpful in some conditions.

 

[PeroK]