Hey eveyone again. Quick question. I am receiving an active sponge from aquatic store. Where should I put the active sponge into my HOB Marineland Emperor 400 filter? By looking at the picture, should I put the sponge to the left of the blue filter cartridge or to the right of the blue filter cartridge? Also, the grey media container that is pictured here has absolutely nothing in it and I don't use it, can that be pulled out to make more room for the sponge or should I really leave it in there? Thanks
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Sent from my SM-G360P using Aquarium Advice mobile app