Is that 100-200ppm range expressed in terms of nitrogen? I would rarely exceed 200ppm N for aloes and agaves even during what's called pulse feeding For constant feed, closer to 150 sounds reasonable. I agree with everyone on the low nitrogen. The only time I may use a balanced N-P-K ratio is for pumping-up seedlings, or like Tim said, early in the season. For finishing and flowering, I recommend that the potassium (K) be at least twice as high as the nitrogen. Phosphorus should be disproportionately high as well. I've found that too much N can exacerbate potassium deficiency. High calcium is important for limestone species.
Your rate and frequency will depend on whether you use soil or soil-less growing media. Lower rate constant feed is geared more towards soil-less media. Also, have your water tested or obtain a water quality report to view nutrients already present in the water.
Matt
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