I'm going to say your water is acceptable judging from the good growth and plant form, they just ran out of food. BX and HP are great products, I use HP myself, but they have no pre-charge of fertilizer, not that one would be of great use. Some of the time released ferts get good reviews, but I have doubts on duration and consistency.
Containers are great but they take a lot of attention and the people who seem to do best work a consistent fertilizer program of some sort. Gerardo does some excellent things with compost teas, beautiful plants, check out his thread too.
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