@Bill Smith, just made one of these yesterday and had to tell you that you took possibly my most frustrating task in fishkeeping (they really should take "Easy" out of the name, because getting these super-bouyant suckers to stay under the substrate, particularly in my tank that has the light Fluval volcanic soil, is a major PAIN) and you made it actually easy. It took me longer to find my root tabs then it did to insert them into my tanks. If we ever meet, please allow me to buy you a drink!