Spawning falling blocks crashes server... Halp

Hello!

So I have a a floor of sandstone and I am creating a sorta quicksand game where the floor randomly disappears. However, I want it a bit more visual and interesting so I decided to spawn a falling block when the blocks disappear. So, the problem is, because it is on a scheduled task, it crashes the server because it spawns too many falling blocks at once.

How can I still have falling blocks without it crashing? One solution I came up with (but failed miserably) was to adjust the repeating task to a shorter timer and only remove one block per loop. But there's a pattern to how the blocks fall - They have a high chance of being chosen from one corner, and a less chance from the opposite...

Here's my class, any suggestions?

Code:java

    public void run() {
        for(int x = -60; x < -47; x ++) {
            for(int z = 215; z < 232; z ++) {
                Location l = new Location(Bukkit.getWorld("Minigames"), x, 103, z);
                Block b = l.getBlock();
                if(b.getType() == Material.SANDSTONE) {
                    int c = x + 60;
                    if(r.nextInt(30) == 0) {
                        FallingBlock fb = b.getWorld().spawnFallingBlock(b.getLocation(), Material.SANDSTONE, (byte) 0);
                        fb.setDropItem(false);
                        b.setType(Material.AIR);
                    }
                }
            }
        }
    }

The blocks fall in to lava and on to slabs... Does that effect anything?

Thanks in advance!

 

please post the error you get when the server crashes.