I would take the prefilter off. The prefilter may be preventing pods
from getting blown into your display tank. I guess it really depends upon the prefilter-- how small of particles it filters. Pods
are pretty small but I could see them being prevented from getting into the display tank with that filter on the pump. Also, a lot of members prefer not to have prefilters at all. They believe that the trapped detritus will cause an elevation in their nitrate levels.