Yeah the plan was that, sandwiched with the black foam. I was just going to enlarge the existing holes and just push them over the media like a hat. Things are kind of stalled right now. I haven't gotten the other containers yet. And I discovered my drill bit set is MIA. I forgot pvc needs metal hss bits...the spade hole cutters I had did nothing! I may as well have tried to cut diamond with a butter knife. Didn't even make a notch. New bits incoming.Interesting approach, sort of a self-contained UGF. I know you plan to fill it with media, but maybe you could slip a foam ring or small sponge filter around the pipe to fit right over the vase opening, act as an easily removable prefilter. Is that what the blue foam is for?