I assume you are not running a sump on your 30g then?
Use the Aquaclear 300 for the fuge, and don't bother buying the mini.
15lbs more rock is minimum, I would get 20 or 25 more, depending on density.
Your rock, fuge, sand bed, and water changes are how you will maintain this tank. It is small enough to get away without a skimmer, although puttin on a CPR bakpakII or an AquaC Remora would improve your water quality and cut down on water changes.
I would grow chaeto in your Aquaclear 300.
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