the tank is 75g. i built the stand myself. the gap is only on the front, the back has no gap so im thinking the front board is just warped a little bit. its been up for around a month now. theres 100lbs of sand. if the back board isnt bowing at all, do i need to worry about replacing the board on the front immediately? the tank is on the second floor of the house, so it definitely would suck if it collapsed.