datablock fxDTSBrickData(brick05x2PlateWaterLayerData){ brickFile = "./0.5x2.blb"; category = "Plates"; subCategory = "0.5x”; uiName = "0.5x2 Water Layer”; iconName = "Add-Ons/Brick_SmallBricksWaterLayer/0.5x2";};
the important part is isWaterBrick = true;