made changes in tanks controller

src/controllers/tanksController.js

@@ -160,11 +160,11 @@ exports.updateTanklevels = async (req, reply) => {
       const tankId = tank._id;
       const tank_name = tank.tankName
       let capacity = parseInt(tank.capacity.replace(/,/g, ''), 10);
-     // let waterLevel = parseInt(tank.waterlevel.replace(/,/g, ''), 10);
+      let waterLevel = parseInt(tank.waterlevel.replace(/,/g, ''), 10);
 
       const intervalId = setInterval(async function () {
-        let waterLevel = parseInt(tank.waterlevel.replace(/,/g, ''), 10);
+        
-        const newWaterLevel = Math.floor(waterLevel - 200);
+      const newWaterLevel = Math.floor(waterLevel - 200);
         
         if (newWaterLevel <= 0) {
           clearInterval(intervals[tankId]);