How to add validation based on field population?

So we have a form that has 15 defined rows with 8 colulmns/fields each. If they need more rows, they can dynamically add another row to continue.
Now what I need to implement is IF you complete ANY 6 of the fields then ALL 6 fields for that row are required.

 
In the above screen shot you can see the default values in 2 of the fields "0" and the others are empty and 2 drop downs..
So what I need to implement is if you change the "0" to anything else, then ALL 6 fields are required(selection made for the dropdowns, complete the 2 empty fields and the other "0" needs to be changed to a value.
Since there are 15 predefined rows and the user may not need all 15, I need to be able to add validation only on the rows that they actually use. And if the user does use all 15 rows and adds say another 3 rows, those also n ...