Did anyone receive a replacement impeller from Rea Sea?

I have a Berlin Turbo Classic skimmer and Rea Sea mailed me a new impeller. The question is do I remove the black caps on each end of the impeller? I also wanted to know about the water outlets. I attached two 1" tubes on my outlets to reach my wet/dry. When the water return out of the outlets do I put the sponge directly under the tubes? Because I have the sponge and the tubes about three to four inches apart and I'm still getting those micro bubbles inside my tank? Thanks for the help in advance.
 
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