Why are you dosing such a large amount of CSM+B relative to KNO3? Normally you would dose about 3-4 times as much KNO3 as CSM+B. And, about the same amount of KH2PO4 as of CSM+B. I suggest you look at the fertilizing forum sticky on dosing, and dose about half or less of what it recommends, since you may have low light. I'm not sure just how much light you do have, without knowing both the type of light and the tank dimensions you have.