I contaced Remora and this is what they had to say:
Thanks for the message, I can help you out. The Remora is not a venturi driven skimmer, so you don't need to use the venturi attachment. Doing so will decrease the amount of pressure the pump can deliver, which will affect the skimmer's performance. The only attachment I would use is the intake strainer, to prevent things from getting sucked into the pump. Otherwise, the pump should be used as it came out of the box. Thanks again, and let me know if you have any other questions!
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Steve Prince
Customer Service Manager
[hr]
I guess that I had is set up wrong from the beginning. I thought because other skimmers need the air intake hose that the remora would as well.