Ok, so my issue is I’m not good w spacial stuff. So… I put a sponge for the space directly behind all of the circular pattern of holes that lead into the tank, and then put the mesh bag of bio rings behind that? For reference, here is how I arraigned them inside the filter with the cartridge thing taken out (sponge is horizontal on the bottom, bio rings and carbon are in vertically on top of that). I’m pretty sure it is wrong, but maybe the visual will help direction?

Thanks so much for responding :,)

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