If the stand is open-bottomed, elevating the stand onto 4x4s or semi-round fence rails will provide the height needed to fit the FX5. I did this on a 150 stand. I used SS angle brackets to join the rails into a rectangle of equal dimensions as the stand bottom. Then, stained and varathaned the rails to match the stand. Finally, I used SS 1/4"x3" wood screws to affix the stand bottom to the rails. Overall, the rails wound up looking like they were part of the original stand construction. An unintentional bonus was that the riser brought the tank bottom level up to the chair back height on the dining set. So, there was an unobstructed view of the tank from the far side of the table.