I am setting up a 125 RR tank at my brothers place. I notice that the floor is uneven, it is about 1/2" from left to right & 1/4" front to back. He has wood floors. I was thinking on building a temporary wood frame on floor with some heavy duty plastic on the bottom to protect the floor and pour some concrete inside the frame and make it level. The concrete will be from about 1/2" to 1" thick from left to right. I would like to know if this would work, is the concrete going to fall apart with the weight of the tank when fully loaded? Should I also put some wire mesh on concrete to make it stronger? the temporary wood frame would be remove ones the concrete dries. Any info would be greatly appreciated.