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I would check your circuit breaker first since you found a few outlets like that. They all might be on the same breaker and it might be wired backwards.
Looking at the back of the outlet, the neutral (white wire) should always be wired to the same side as the ground wire is on. (green screew)
Make sure you turn off the power before playing with electric.
dangerous... not really.. mostly everything we use in our homes will work either way.. But its not a big deal to correct... Make sure the circuit is off at the breaker and then the black wire should be on the brass screw of the outlet and the white wire goes to the silver screw of the outlet.. Barewire or Green wire goes to the Green Screw..
If you want an instant cycle, you can buy a bag of BIO-Speria and add things the next day.
I never did the shrimp thing so not sure. I'm impatient and used Bio-Speria on all my starting up tanks.