Just a thought- instead of the PVA & sand method (which is the stage I always hated because of the mess it makes) try mixing up a texture paste- PVA, sand, grit, a bit of filler (aka spackle) and even black paint. Instant undercoat, no mess, time saved! Also, cat litter is my go to material for rocks, probably cheaper than aquarium rocks. Check out Luke's APS on YouTube, that guy is all about terrain.
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