I bought this from someone on reefecentral. Since I'm not familiar with Nilsen Reactors I'm not sure if this is complete or is missing parts. I don't see a "stirrer" referred to in the directions. I was expecting to see a rotating bar of some sort but I don't see one. I'm kinda stressing that I may have been taken so please ease my fears 
Some photos to help you:
Full shot:
Top Half:
Bottom:
Some photos to help you:
Full shot:

Top Half:

Bottom:
