tunze nano

I have two 6055s on a 7095 multicontroller. When I press the food timer I notice the propeller intermittently spins counter clockwise for a second (I guess to startle any livestock). When it turns on again I think it spins counter clockwise as well. Is this normal or are they spinning in reverse?
 
If it is pumping water it is spinning the right way. I checked on a 6080 which if you spin backwards the breaks flare out and only assumed it was the same for the nano streams.
 
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