I currently have a 55 gallon reef with about 120 lbs. of LR in it. If I was to go up to a 90 gallon what should I do to support the floor? I live in a townhouse and the tank is currently in my livingroom supported by 4 floorjoists underneither it running perpendicular to the tank. If I go to a 90 it's going to be about 300 lbs. more after I add more LR. What should I do?