OK, it sounds as if you have some stray voltage from one of two sources your lighting or you have what is called a hot/ground reversal on that outlet or a similar short within the power strip. You can check your outlets with a $5 outlet tester from HD or Lowes. As for the lighting, if you tell me what kind of lights you use I could be more help. Basically, something in your tank is leaking current and because the pump is grounded it is carrying the current away and completing the circuit.
BTW- I am very sorry for the Troll post comment earlier. I read in the past thread you had contacted Champion and the first thing I did was check all of our batch info and product numbers and call the delaers to see who had what. This was a "shocking" post as I have never seen a Tunze pump shock anyone even in pretty bad shape, they have several safety systems to cut themselves off if they are flawed or tampered with.