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Great write-up.
My opinion/observation
That lighter green color is what you should be after. it is actively growing. Dark green chaeto usually doesn't do much, just sits there and looks pretty.
BTW, i really don't think you can give it too much light. i had a greenhouse aquarium. The chaeto was getting full sun (way brighter than any CF) I was pulling out over 5 gallons of the stuff each week. (it was the light green shade)
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