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If anything, yes you can remove the rocks and place them into a bucket with water. The same with sponges and whatever other media you may have.
You could also leave a thin layer of water in the tank for the sand to stay wet. It may make a mess though with the back n forth of the car but...
The aquatic life hybrid is a nice fixture and more budget friendly. Plus it gives all those mounting options for your LEDs. I would get 1 so that you avoid the extra cords...
I think it would be a but much for all those tangs and angels.....but that's me.
I think it will also depend on what your filtration system will look like.