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A couple small suggestions:
dump the air-stone and add a power head. The power head by itself will turn over your water to keep it oxegynated and keep detritus off the bottom so it can be filtered out.
I would replace the sponge every three days to avoid letting the trapped organics rot into nitrate. Alternatively just pull it out, you should get faster flow through the rest of the media that way.
Good Luck.
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