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It's nitrate. The debris you leave behind will increase your nitrate faster than if you remove it.

If your filter sweeps it all up so your substrate looks pristine, you can remove the solids by cleaning your filter. However, I have never vacuumed my substrate after a period of no vacuuming and had it come up clean enough to make me happy.

You also will get nematodes (usually harmless, but gross) if you don't vacuum...even on a bare bottom tank.
 
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If there is no debris or discoloration on your substrate, and it is clean when you do the occasional check with the vacuum, in theory no.

If you like nematodes.

And if your nitrate stays below 20ppm.
 
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What are your issues with the siphon method of vacuuming? What grain size is your aragonite?
 

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With anything approaching gravel vacuuming is essential. Have you tried the Python? Your tap water pressure creates extra suction if gravity alone is not enough.
 
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It is not unusual for tanks to be trouble free for the first 9 months. Plan on having a trouble-free mix by the time two years have elapsed.
 
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