Just to update:
Purchasers came to the home yesterday to do a prepossession walk through. Previously I had the tank off; lighting, return pump skimmer pump, ATO ... all off. All the live rock I moved to the SW mixing tank which had a heater and powerhead running. I turned everything on the morning, and I guess the water in the SW mixing tank dropped a bit exposing a bit of the live rock to air, and it caused a bit of a smell!
Anyways the purchasers were all ****ed off that 1. The sump and mixing tanks were left (plumbed through the house) and 2. The smell of the live rock
So last night at 8 pm we get an email requesting us to remove the sump and the mixing tank. We explained that that equipment is part of the Aquarium system and then they changed their request to remove the rocks and drain the water (175 Gallons + 150 lbs of live rock) with 4 hours till we don't own the house anymore!!
Anyways my wife and I basically said F these people ,and today all the funds were transferred. So yeah, these people have been a treat to deal with! I should have drained the SW tank and sump and let all that live rock stink up the whole house!

Hey its what they wanted right?