2n10 uses this fertilizer so I looked it up online. It sounds very good and should keep the 10:1 ratio in check. GLA doesn't give a very specific description of how many gallons this treats. Mine is a 30g. so will one bag last for a while? And, I assume it provides specific instructions on how much to add. Additionally, what if my ratio is not now in balance? Does it explain how to equalize everything? Is this the right stuff to add or do you feel it's better to have separate bottles of fertilizer to compensate one way or the other for nitrate and phosphate imbalances?