I don't think that will work with the sponges.
Yeah. I'd end up cleaning the sponge as a part of regular maintenance and dumping the pods
into the tank that were in it. Heck, once you get enuf living in the main in all those nooks and crannies of the rock, maybe it wouldn't be as critical to get them to flow thru your return.
I'd clean the sponge/filter in a bucket. Empty the bucket into a net and drop the ccritters in the main. Those that don't get eaten when they first drop make a bee-line to the rock.
Still wonderin' though if pods
don't get killed anyway going thru the pump. I'm sure I don't know enuf about pump construction, but I'd wonder if they didn't get squished coming thru it.
If they do, then I'd try more sponge (to be cleaned every 2 weeks) where you almost have enuf now.