Thanks Drew for your answer. Now that I have some inforation and have decided to use additives, whats the formula? Looking around I see several. I have a 36 gallon tank. Can someone or everybody explain the formula or equation and the difrrence between the color of the bottle of PSD.

 

16 ounces grey bottle, 8 ounces MMO, the white bottle is for cold weather its an anti-gel formula

 

Thank You Troop