Cubes in pool

I have added cubes in the pool to act as blocks. The player will move between the gaps of the block. But as I add more blocks, they started crashing into each other. I want my blocks to float side by side with each other in the pool without touching each other. But they kept hitting each other and flying out of the pool. I tried reducing the mass but it did not work. What should I do?

This is the script I am currently using:

 var waterLevel: float;
 var floatHeight: float;
 var buoyancyCentreOffset: Vector3;
 var bounceDamp: float;
 
 
 
 function FixedUpdate () {
     var actionPoint = transform.position + transform.TransformDirection(buoyancyCentreOffset);
     var forceFactor = 1f - ((actionPoint.y - waterLevel) / floatHeight);
     
     if (forceFactor > 0f) {
         var uplift = -Physics.gravity * (forceFactor - rigidbody.velocity.y * bounceDamp);
         rigidbody.AddForceAtPosition(uplift, actionPoint);
     }
 }

Thank you :)