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You can use whatever grit of paper you choose or their "special" kit supplies for way more money. BUT I'm letting you know that at 1,800 grit you will be sanding for a long time to get down to the depth of that scratch that you say you can see from two feet.
Using wet/dry sand paper is way cheaper.
The particles won't hurt the fish.
You don't have to take them out.
The particles will get skimmed out in your skimmer(may overflow depending on how concentrated the particles are).
I don't know who makes the Hammerhead magnets but they are much stronger than the Mag Floats.
You can use several rubber bands to hold the paper to the magnet.
You don't have to get your hands wet to use wet/dry paper on a magnet. Much easier to see what you are doing from "outside" the tank.
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Freed
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