I hope this isn't too simple a question, but I'm trying to find out the difference between Flourish and Flourish Excel (and what's appropriate for what). The differences between the marketing text seems minor to me -- comprehensive supplement vs. liquid nutrient, etc...aren't they both liquid fertilizer for aquatic plants? It looks like Excel advises very frequent dosing though. Dosing anything every 2 days seems like overkill when I'm running a low light/low tech setup...so I'm thinking Flourish is more for me. Does that sound right? Will that take care of both macro and micro nutrients that my low demand plants need?