Someone had a good idea above earlier and Ill add. Put fish in tote/pool. Drain and move tank over enough for floor guys to remove the portion under tank and put in tile for that area. Most will be understanding and will work around that. Move tank back after a couple days. Fish back in.So the 400 is going on a different wall so was hoping to keep as close to in place as possible and move over. But have to get the floors in now because this would be virtually impossible once the 400 is in.
Whatever you decide to put fish in I'd suggest a cover...you can't be too careful.