Crazy, right?! But, read about this stuff on the planted freshwater aquarium forms. The product is called Safe T Sorb™ Oil Absorbent #7941, it is a kiln fired clay product (remind anyone of hydroton?), and at Tractor Supply Co. the stuff costs $5 for a 40lb bag! Supposedly, it has to be the #7941, in the green and white bag. Most other absorbents are the last thing you'd want in a media bed becau…