If you have a sump, drain the water from the sump. Not sure otherwise. Esposing the LR
for a shortwhile might be ok but not hard corals. Ideally, you should not have to do so many water changes. Is this a new setup? I would assume since you are battling nitrates, this is an older tank? What is your nitrates?
*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,