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If the kessill is too intense, and cannot be positioned further away from the chaeto to reduce intensity, a shorter on period probably won't fix the problem.
I know with a scrubber that the light intensity recommended is quite specific - 0.25 to 0.5 watts per square inch of screen, 660nm. Its the photoperiod predominantly, & flow rate over the screen, that determins how much filtering (inorganic nitrogen & phosphate removal) the algae does.
With light intensity, as it increases, the rate of photosynthesis increases. But only to a point.
Then comes photo-saturation, where the rate of photosynthesis peaks at a particular light intensity.
If the light intensity continues to increase, this can cause photo-inhibition, or in other words, the rate of photosynthesis starts to decline, & it can decline significantly. If your kessil is too intense your chaeto will struggle for this reason.
And with chaeto, I remember reading Dana Riddle's comment that chaeto requires very little light.
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