Dax was missing her spots when Arjin came to visit her quarters.
When leaving the station with the protouniverse, Dax says to proceed at 50 K.P.H. (Kilometers per hour), which is about 31 mph, yet they reach the mouth of the wormhole in just seconds, which would put the wormhole just a few feet from the station. Not at all realistic. Later, while IN the wormhole and they decide to proceed "slowly" Dax says their velocity is 40 meters per second. That equates to almost 90 mph. It appears as if whomever wrote this dialogue didn't know beans about speeds.
They bring back the proto-universe to the Gamma Quadrant, where it will expand and damage everything it expands into. Doesn't solve the actual problem.
The voles are a problem on DS9, yet no-one thinks to use a Federation transporter, available on any runabout, to beam them off of the station.