watering problem

I'm using of potting soil and I mix my nutrients with water in a one gallon jug and slowly pour it over the soil surface. However when doing this it causes the soil to settle like a sink hole. How do I keep this from happening?

Anyone have any tips for me?

That simply means you have air pockets in your medium. I have the same problem from time to time. Just add more soil to fill the gap, totally not a big deal.