okie dokie.. my last bit of lr comes today so I will add more water then..
I would add the water first. When you add the rock, water will be displaced and you might not "need" water anymore. I would get the SG
right first, then remove water if needed while adding the rock. With a sump, this will not be too big of a deal but you can overfill a sump too.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,