02-08-2010, 10:34 PM
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Say's it underneath the chart: Green-Good; Yellow - High; White - too little
That depends on your believes I'd have to say.
Me pers yes I would add Excel and have added Excel to brand new (few days old) set ups against Algae and not being able to have fish in the tank for a while (so even with no fish I could supply my plants with co2).
Other members here will be strictly against that because its a new set up and will tell you to let it run by itself for a while.
You need to know for yourself what makes most sense to you.