Don't think its a phase, I'm preaty sure they are there to stay. But not sure, though there are fish that will eat these things like a Mandarin. I am thinking of getting a Mandarin maybe a Target or blue mandarin but will wait for the population of pods to increase alot more. I think that the tank need be setup for atleast 6mons or so. Someone correct me if I'm wrong cause I wouldn't want to get one if he/she can survive.